They have also released an E-fit picture of the prime suspect and a photo of a Range Rover seen speeding down Fulham Palace Road, in west London, shortly after the murder.

DCI Hamish Campbell has appealed for any of the people seen in the Fulham area to come forward. Only one man, a surveyor who happened to be in the area at the time, has come forward so far. He was not spotted by any of the witnesses and was eliminated from the inquiry.

The Range Rover seen speeding down Fulham Palace Road

Pulling together all the information so far, police have built up a picture of the sequence of events before, during and after Ms Dando was shot in the head.

10.05 - Ms Dando leaves her fiance's house by car.

10.23 - She stops for petrol at a BP garage on the Great West Road.

10.46 - She is seen at Rymans stationers at the Hammersmith shopping mall.

10.55 - Ms Dando is spotted at Dixons Link electrical shop. She also bought two fillet Dover sole fish and police are trying to track down the shop where she got them from. She received and made a number of calls during her shopping trip.

10.40 - A window cleaner working at No 26 Gowan Avenue sees a man with light coloured hair, smartly dressed in a light grey two-piece suit talking into a mobile phone. He was loitering outside Ms Dando's house at No 29.

About 11.30 - Ms Dando is murdered on her doorstep by a single bullet from a 9mm semi-automatic pistol. Screams were heard but no gunshot. Two witnesses saw a man running from No 29. He was said to have thick black hair and be wearing a waxed jacket. At a similar time a man was seen standing at the junction of Gowan Avenue and Munster Road. He was wearing black-framed glasses and was in an agitated state looking down the two roads. He was said to be in a dark-blue pin-striped suit.

Shortly after 11.30 - A motorist is forced to brake sharply while driving along Fulham Palace Road when a smartly dressed man runs out in front of him. He described the man as about 5'11", with short dark hair and dressed in a dark suit. Also, two witnesses saw a man near Bishops Park using his mobile telephone and hanging an arm over the park railings.

11.45 - A witness at a bus stop outside 389 Fulham Palace Road sees a man coming from the direction of Bishops Park. He comes to the attention of the witness because he is sweating profusely with perspiration running into his collar.

He also had a mark on the bridge of his nose that suggested he may have been wearing glasses. This witness provided E-fit information to police.

When the bus finally arrived before midday he did not get on it with the rest of the passengers, according to the witness.

11.52 - A picture from a CCTV camera shows a metallic blue Range Rover on Fulham Palace Road travelling south at high speed. The car was seen leaving Doneraile St opposite Gowan Avenue. It had one person in it and it leaned over as it swept into the main road.

The driver was seen running a red light before driving south and was filmed by the camera at Putney Bridge.

DCI Hamilton said the man at the bus stop could not have been the same person as the one in the Range Rover which may indicate Ms Dando's killer had an accomplice.

He renewed an appeal for anyone who has not come forward to contact them as soon as possible with information relating to the murder.