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By Colin Moffat
1455: That's enough from me. Both Old Firm sides were convincing winners this weekend. Celtic have four matches to go, Rangers have three. If the Glasgow rivals keep winning, it's the team in green and white that will prevail. Stay tuned to discover what happens and enjoy the rest of your weekend...
1452: Remember, you can see online highlights of yesterday's SPL games on this very website from 1800 BST. The action from Celtic's victory will be available after it's been on the telly on Sportscene tonight.
1450: "I thought we were superb and it could have been a lot more," a delighted Celtic boss Neil Lennon tells BBC Radio Scotland. "We had good pace, a good tempo and good aggression about us."
1447: "I've no complaints about the result," says Dundee United manager Peter Houston. "Celtic were the better team but the goals we lost were poor and that's very disappointing."
1444: United boss Peter Houston was giving referee Iain Brines an ear-bashing as the teams went off. I think he was upset at Jon Daly's yellow card and a frustrating day at the office just bubbled over in a hissy fit of temper.
1441: United had their moments after the break but Celtic were on top for most of the game and Kris Commons was a delight to watch, with his range of passing and clever link-up play. Beram Kayal was also in the mood, complimenting his tough tackling with some fine touches and an absolute belter of a goal.
1438: Full-time: Celtic 4-1 Dundee United Celtic move to within a point of SPL leaders Rangers after a comfortable victory. Gary Hooper, Beram Kayal, Kris Commons and Daryl Murphy were on target for Neil Lennon's side, who can top the table if they don't lose Wednesday's game in hand at Inverness.
A top-notch goal from Daryl Murphy but it's more dreadful defending from United as the big striker weaves away far too easily from four opponents before shooting beyond Dusan Pernis.
1437: GOAL Celtic 4-1 Dundee United (Murphy)
Johnny Russell is rewarded for an enterprising second half cameo, slamming in from close range after good set-up play from David Goodwillie.
1436: GOAL Celtic 3-1 Dundee United (Russell)
1435: Beram Kayal slides a neat pass through to Kris Commons but Dusan Pernis gets down quickly to smother the midfielder's shot from 16 yards.
1433: Now that's harsh. Jon Daly picks up the game's first yellow card for a late challenge on Charlie Mulgrew. There was nothing in that and certainly no complaint from the Celtic defender.
1432: I was wrong about that Celtic change. Scott Brown was the man to make way for Murphy.
Shaun Maloney skips by Garry Kenneth to cut the ball into the middle of the goalmouth, where Paul Dixon scuffs a clearance straight to Kris Commons and he gleefully slams in a fully-deserved shot.
1430: GOAL Celtic 3-0 Dundee United (Commons)
1429: Daryl Murphy is getting his instructions from Celtic assistant manager Johan Mjallby. Anthony Stokes will be the man coming off.
1428: Kris Commons cleverly engineers room for a shot 20 yards out and Dusan Pernis has to watch the swerving ball all the way to make a good save.
1425: It's hot potato time again for Fraser Forster as he twice fails to gather under pressure but United cannot profit from the big goalie's uncertainty.
1422: Garry Kenneth pops up on the left wing and flashes in a great cross that Fraser Forster awkwardly flaps straight to David Goodwillie but the United striker can't react quickly enough and his control lets him down, with the goal gaping.
1420: Shaun Maloney is coming on now, with Gary Hooper applauding the home fans on his way off.
1418: United winger Craig Conway drags his team-mates up the pitch with a run from his own half but his drilled delivery is cut out by the arms of goalkeeper Fraser Forster.
1415: Kris Commons is really enjoying himself out there as he sends a teasing ball into the danger zone but Gary Hooper and then Scott Brown fail to control in promising positions.
1412: Another excellent pass from Kris Commons opens up the United defence but Emilio Izaguirre is guilty of over-hitting his cross and a good opportunity is wasted.
1410: Garry Kenneth gets a vital touch to prevent Gary Hooper from tucking away a great threaded pass from Kris Commons. From the corner, Dusan Pernis clutches on to a header from Scott Brown.
1409: Well, wee Chick was half right. James Forrest trots off to be replaced by Ki Sung-yueng.
1406: Forster has to look sharp to beat away a shot from Morgaro Gomis before a stretching Johnny Russell can only loft the ball onto the roof of the net after escaping from the Celtic defence. United are looking sprightly in attack.
1403: United sub Johnny Russell waltzes past two Celtic defenders and is unlucky to see his shot from ten yards cannon off the base of the post, with keeper Fraser Forster well beaten.
1402: Beram Kayal suddenly has a taste for this goal-scoring thing and stings the palms of Dusan Pernis with a raking strike from the edge of the penalty area.
1401: United make a couple of changes, with strikers Johnny Russell and Jon Daly coming on. Prince Buaben and Danny Swanson trudge off. A positive move from Peter Houston...
1400: "That will calm the Celtic nerves, because United have started this half brightly," BBC Radio Scotland pundit Billy Dodds.
Pick that out! Celtic midfielder Beram Kayal collects the ball up in central position and hammers and absolute screamer into the corner of the net from 22 yards. He doesn't score many but that was a belter!
1359: GOAL Celtic 2-0 Dundee United (Kayal)
1357: Celtic are claiming for a penalty as James Forrest stretches to reach a Kris Commons cross and the ball spins up on to the hand of Paul Dixon and out for a corner. A shake of the head from ref Iain Brines.
1355: Garry Kenneth goes some way to atoning for his earlier blunder, hacking away a strike from Anthony Stokes that looked to be creeping beyond Dusan Pernis. The big defender is also on hand to nod clear a headed follow-up from Celtic skipper Scott Brown.
1353: United make their way into the Celtic penalty box as Prince Buaben sets up midfield colleague Morgaro Gomis for a shot. Groans from the small section of visiting fans as the ball is scuffed horribly wide...
1351: James Forrest is left red-faced as a simple pass from Gary Hooper rolls under his foot and out for a United throw-in. During the interval, our trackside reporter Chick Young was suggesting a swap with Shaun Maloney for the youngster. That mistake hasn't done the kid any favours but he was lively in the first half.
1350: The second half is underway. No changes in personnel.
1346: Gavin in Perth via text on 80295: " Celtic have a 12th man today. No, not the crowd, but Garry Kenneth, who has been Celtic's most dangerous player." It's a cruel, cruel game. You can bet the big defender is getting an earful from manager Peter Houston for his lapse that led to Gary Hooper's goal.
1344: At 1-0 down, Dundee United are still very much in the game but if Celtic can grab another goal it's hard to see any other outcome than three points for the home team.
1340: The Celtic Under-19 squad is basking in warm applause at Celtic Park as they are presented with the trophy for winning their league. It's a double for the youngsters, who beat their Rangers counterparts in the cup final at Hampden last week.
1338: lauriedunsire on Twitter using #bbcsportsound: "I think the one game that can affect the title race is Celtic's game at Tynecastle. Remember Austin McCann..." Following today's game, Celtic have three away fixtures, at Inverness, Hearts and Kilmarnock.
1335: Half-time score: Celtic 1-0 Dundee United A glimmer of hope for United in the final few minutes of a first half dominated by the home side. Celtic have been on the front foot for most of the match but it took a gift from their opponents to set up Gary Hooper's goal.
1333: Beram Kayal somehow escapes a yellow card for a terrible, scything tackle on Craig Conway. Referee Iain Brines must be in a good mood with all the sunshine, or maybe he has sunstroke...
1330: Two good opportunities for Dundee United as David Goodwillie outmuscles Beram Kayal in the penalty box but the striker lacks composure and his shot is blocked when a pass to Craig Conway looked the better bet. Sean Dillon then breaks into the penalty area but gets the ball tangled up under his feet.
1328: "I think what has happened is that after the way they lost the goal, Dundee United have lost all confidence to play difficult passes and are just sending aimless balls up the park," BBC Radio Scotland pundit Billy Dodds.
1326: James Forrest cuts in from the left and only has one thing in mind as he lets fly with a strike from 20 yards. Unfortunately for the Celtic youngster, the ball skews well wide of the target.
1323: Apologies for the slowdown after the goal. This computer can really pick its times for freezing...
1319: Dundee United really are on the ropes, with the pace of Emilio Izaguirre and James Forrest causing them all sorts of problems. The visitors just can't retain any kind of possession.
1316: Stokes is at it again, this time nodding just over after connecting with a cross from Emilio Izaguirre.
1314: Anthony Stokes is brimming with confidence as he controls a ball dropping out of the sky, swivels, and sends a shot flashing narrowly wide from 20 yards.
Dundee United had been defending so well but that was a horror show. Garry Kenneth gifts the ball to Anthony Stokes and Scott Severin is caught in no man's land as the ball is crossed for Gary Hooper to tap in his 19th goal of the season.
1312: GOAL Celtic 1-0 Dundee United (Hooper)
1310: Garry Kenneth proves a good barrier for United again, heading clear a cross from James Forrest. The resulting corner reaches Daniel Majstorovic but the big defender can't control the ball on his chest and the danger is mopped up.
1307: Dusan Pernis does well to come and gather a dangerous delivery from Emilio Izaguirre at the edge of his six yard box. Gary Hooper was in close attendance and is always a menace for defences.
1306: leewallace9 on Twitter using #bbcsportsound: "I can see Dundee United snatching a surprise win, when attacking they're looking dangerous."
1304: Celtic left-back Emilio Izaguirre bursts into the penalty box but Garry Kenneth gets across to cut out the Honduran's cross.
1302: Celtic winger Kris Commons does well to twist past a couple of challenges in the penalty area and drills the ball across goal. Anthony Stokes sticks out a foot and directs a shot against the base of the post.
1301: Sheaffdawg on Twitter using #bbcsportsound: "Not enough backbone to the Celtic midfield today, I'm worried."
1300: "Celtic have changed their two wide players, with Kris Commons coming to the right and James Forrest going to the left," points out eagle-eyedBBC Radio Scotland pundit Murdo MacLeod.
1258: Dundee United left-back Paul Dixon whips in a wonderful cross but none of his team-mates can get on the end of the delivery.
1256: Celtic defender Daniel Majstorovic is making his presence felt in the opposition penalty box. He has a shot blocked before heading over from the resultant corner kick.
1255: Prince Buaben gifts the ball to Beram Kayal in the centre circle but the Celtic midfielder is crowded out at the edge of the penalty area.
1254: Celtic manager Neil Lennon has a nasty-looking cut on his forehead. An accident on the golf course, I'm told.
1252: William via text on 80295: "If I was Ally McCoist I'd be going straight in for Prince Buaben & David Goodwillie for next season. Buaben would bring some much needed drive to the midfield & Goodwillie up front with Jelavic would be frightening for SPL defenders."
1251: James Forest cuts into the penalty box from the right and fizzes in a shot that Dundee United keeper Dusan Pernis does well to block with both hands.
1250: seanbhoy87 on Twitter using #bbcsportsound: "Expecting close match, any sort of win will do me en route to winning back the title. Hooper double"
1249: Referee Iain Brines blows his whistle and Dundee United get the game started...
1246: The teams line up at the centre circle for a minute's applause in memory of Willie O'Neill, who played at full-back for Celtic in the 1960s.
1244: The teams are in the tunnel. Not long to go now.
1243: Was it really October when a late Gary Hooper strike at Tannadice gave Celtic maximum points? That game is best remembered for referee Dougie McDonald awarding the visitors a penalty after United goalkeeper Dusan Pernis challenged the Celtic striker, then controversially changing his mind after consulting assistant Steven Craven. It all seems so long ago, or is it just me, with end-of-season fatigue setting in?
1240: Scotland manager Craig Levein and Everton boss David Moyes are among those enjoying the sunshine at Celtic Park today. Is Mr Moyes on a scouting mission or just cheering on his old club?
1238: "I think it will be comfortable for Celtic today," says BBC Radio Scotland pundit Murdo MacLeod. "There is a real edge to the Old Firm sides as we get to the business end of the season."
1236: TEAM LINE-UPS FROM CELTIC PARK: Celtic: Forster, Wilson, Izaguirre, Majstorovic, Mulgrew, Forrest, Brown, Kayal, Commons, Hooper, Stokes. Subs: Zaluska, Ki, Rogne, Samaras, Maloney, McCourt, Murphy. Dundee Utd: Pernis, Dillon, Kenneth, Severin, Dixon, Scott Robertson, Buaben, Gomis, Conway, Swanson, Goodwillie. Subs: Banks, Daly, David Robertson, Douglas, Watson, Russell, Armstrong.
1235: United have four players back from suspension and three of them - Morgaro Gomis, Sean Dillon and Paul Dixon - go straight into the team.
1233: Along with Anthony Stokes and Kris Commons, James Forrest is back in the Celtic XI, with Georgios Samaras, Ki Sung-yueng and Joe Ledley, who is out for the rest of the season with a hamstring injury, dropping out.
1231: Celtic duo Gary Hooper and Emilio Izaguirre are up for the player of the year gong, along with Kilmarnock playmaker Alexei Eremenko and Rangers' Steven Naismith.
1229: Goodwillie, who has scored 16 goals this season, is the strong favourite to pick up the young player of the year award at the PFA Scotland ceremony in Glasgow tonight.
1227: There are going to be big changes at Tannadice over the summer, with Houston resigned to losing influential midfielders Craig Conway, Prince Buaben and Morgaro Gomis at the end of the season. David Robertson is another one who could walk away for free and a bid of £2m would see star striker David Goodwillie on his way.
1224: "We're here to attack. If we can get Danny Swanson and Craig Conway on the ball, we can cause them problems. We did it at Ibrox last month," explains Dundee United manager Peter Houston.
1222: "We know our destiny is in our own hands and that's great but it will be a tough game today, the games with Dundee United always are," Celtic manager Neil Lennon tells BBC Radio Scotland.
1220: Peter Houston's side had a recent success in Glasgow, winning a 3-2 thriller at Ibrox on 2 April and they picked up a point on their last visit to Celtic Park in November, thanks to Sean Dillon's header in the third minute of added time.
1218: Dundee United have been closing in on third-placed Hearts at a rapid rate of knots but may just be running out of games. A win today would move them to within five points of the Jam Tarts.
1215: Anthony Stokes and Kris Commons are restored to the Celtic starting line-up after being left on the bench for last weekend's Old Firm 0-0 draw at Ibrox.
1212: Of course, Celtic have played two games less than their fierce rivals and if they win all of their remaining fixtures the title will be theirs.
1210: Good afternoon and welcome to our Scottish Premier League coverage. Celtic host Dundee United, knowing a win will move them to within a point of leaders Rangers.
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