Wallwork (left) and Robertson had to work hard for the win
Nathan Robertson believes he and Jenny Wallwork remain on course for their Olympic target after successfully defending their domestic crown.
The pair, ranked ninth in the world, beat Chris Adcock and Gabby White 21-18 16-21 21-17 in the English National Championships final in Manchester.
"We know the level we have got to be at and it has got to be higher than we reached this weekend," said Robertson.
"We have to step up to another level when we go to the major tournaments."
It was 33-year-old Robertson's sixth mixed doubles title and he is hoping to better the Olympic silver he won with Gail Emms seven years ago when he competes in London in 2012.
"We are absolutely on course for London. I said this summer I wanted to be within the top eight in the world," he added.
"We've already been as high as fifth but dropped down again because it is so tight between five and 10."
Both Wallwork and Robertson followed up their victory by winning in the women's and men's doubles finals respectively.
Wallwork, who needed treatment on a leg muscle injury ahead of the finals, teamed up with White to see off Heather Olver and Mariana Agathangelou 21-7 21-17, while Robertson paired with Chris Langridge in a 21-12 21-17 win over Adcock and Andy Ellis.
Robertson's win in the men's doubles was unexpected, as he was not even entered in the event at the start of the championships.
Langridge was due to partner nine-times winner Anthony Clark but a freak injury to the latter - struck in the eye by a shuttlecock in training - led to Robertson stepping in at the last moment.
Robertson has now won the men's doubles title four years in succession and nine times overall, while Langridge was victorious for the first time.
Langridge, 25, said: "Clarky rang me Friday morning and as soon as he started speaking I could tell it was bad news.
"I started to feel tense because I didn't know what I was going to do. It was good of Nath to play because I know it has taken a lot out of him with the mixed as well.
"I could have been sitting at home without any money, no title and wondering 'what if'. I've had a few finals but never won one, so to finally do it is very good."
British men's singles number one Rajiv Ouseph became only the second man to win four singles titles in a row with a convincing 21-10 21-16 success over Carl Baxter.
The world number 15 was rarely troubled as he overcame Canadian-born Baxter for the third successive year, winning in 33 minutes.
Ouseph said: "Today was good. It was a little tougher than my other matches this week so I had to be ready from the beginning.
"This is a sign of a bit more consistency from me and hopefully I can keep on winning."
Third seed Nicola Cerfontyne edged a three-game thriller to claim her maiden women's singles title at the expense of fourth seed Sarah Walker.