Ed McKeever lost his world title but still won one of three silver medals for Britain at the World Championships.
McKeever was beaten by Poland's Piotr Siemionowski in the 200m kayak single.
"It's funny to win a silver medal and be disappointed but races like this are down to fine margins," he said.
But, in another 200m event which joins the Olympic programme for 2012, kayak double Jon Schofield and Liam Heath upgraded last year's bronze, finishing behind France in the 32-second dash.
Earlier GB's Lani Belcher also took silver in the non-Olympic 5000m event at the event in in Szeged, Hungary.
Australian-born 22-year-old Belcher, who missed out on a world medal last year but is reigning European champion, beat last year's silver medallist Maryna Paltaran of Belarus by 11 seconds in 22 min 26.572 sec.
"Very pleased," she said on Twitter. "Sweet revenge on last year."
Jess Walker qualified for a place at London 2012 in her single but was disappointed to finish seventh, out of the medals, saying: "I did everythng I could but it just wasn't fast enough."
The results come two days after Great Britain's four-woman kayak also qualified for a place at London 2012 by finishing fourth in their 500m event, missing out on a medal by 0.1 sec.
Three leading British men failed to clinch medals or 2012 qualification, though, and must now seek places through next year's European Championships.
Triple Olympic medallist Tim Brabants, competing in the 1000m kayak double with Ben Farrell, finished sixth in the B final - 15th overall.
Paul Wycherley beat Brabants last month in a race-off for selection for the K1 1000m - the event in which Brabants won Olympic gold in Beijing - was also pushed into the B final, finishing fifth.
But Brabants told BBC Sport: "I'm really happy. We've had three weeks to prepare and each time we've raced its gone better and better.
"This year has been tough, coming back from injury I didn't get time to focus on the Worlds.
"Next year I'm going to focus on getting that K1 spot and getting another gold in London."