2007 Moves back to the British Superbike championship by signing for Rizla Suzuki.
2006 Remains with PSG-1 Kawasaki Corse in a three man alongside Regis Laconi and Fonsi Nieto. All three are often evenly matched but Walker fears for his future as early as mid-season as it is heavily rumoured that the team will be cut to two riders for 2007.
Walker goes on to take a stunning last-to-first debut WSBK win in the soaking rain at Assen - Kawasaki’s first WSBK victory since 2000 – and finishes the year as the leading Kawasaki rider (ninth in standings) but not even that is enough to secure his future with PSG-1, which instead opts for rising star Nieto and former championship runner-up Laconi.
With few leading WSBK rides available, Walker patches up his relationship with Suzuki and signs to ride for the Rizla team for another crack at the British championship in 2007.
2005 Moves to PSG-1 with their new Kawasaki backing. Takes a best finish of third during an impressive season in which he often runs at the front. Finishes 9th in the championship - despite sitting out two rounds after being hit by Jurgen van den Goorbergh early in race one at Assen, breaking his arm.
2004 With GSE withdrawing from WSBK, Walker finds himself out of a ride and despite offers to return to BSB, signs for the Foggy Petronas Racing WSBK team. Finishes 11th overall but makes history with the team's first ever podium, at the Valencia season opener.
2003 Signs for HM Plant Ducati to replace Neil Hodgson, claims six podiums (despite riding with injuries) to finish the season sixth.
2002 WSBK with Fuchs Kawasaki.
2001 Gets a MotoGP ride with Shell Advance Honda, but suffers several large crashes as he adapts to the two-stroke. Leaves after Donington Park.
2000 2nd in British Superbike Championship with Crescent Suzuki. 14th in WSBK as a wild-card after finishing 2nd at Donington and 3rd (twice) at Brands (82 points).
1999 2nd in British Superbike Championship with Kawasaki. 21st in WSBK as a wild-card (31 points)
1998 2nd in British Superbike Championship with Kawasaki. 28th in WSBK as a wild-card (9 points)
1997 2nd in British Superbike Championship with Cadbury´s Boost Yamaha. 16th in WSBK as a wild-card (47 points)
1996 Debut season in British Superbike Championship with Old Spice Ducati. First ever ride on a Superbike at the European race at Donington – rode Steve Hisplop´s bike to finish third behind Aaron Slight and Simon Crafar.
1995 British 250cc Champion with Padgetts GP Racing. Won 'Race of the Year' at Mallory Park and was 2nd in the British 250cc Supercup with Padgetts GP Racing.
1994 Won EMRA Club Championship and Shell National Clubman´s Championship.
1993 5th in AMC British Championship but winning several club and centre championship.