Career
He competes in the S7 (butterfly and freestyle), SM7 (medley) and SB7 (breaststroke) classifications. Walker"s first international medal came with a bronze in the 100 m breaststroke at the 1997 European Championships in Spain. Paralympics
Walker competed in the Paralympics for the first time during the 2000 games, in Sydney.
In all he took home three medals from these games, a bronze in the 100 m breaststroke SB7, silver in the 50 m freestyle S7 and gold in the 4×100 m freestyle 34 pts.
As part of the gold medal winning relay team, which also included Jody Cundy, Giles Long and David Roberts, he set a new world record time of 4:06.85. He was again part of the gold medal winning 4×100 m freestyle 34 pts relay team, which also included Roberts, Graham Edmunds and Robert Welbourn, that set a new world record of 3:59.62.
He medalled in both the 50 and 100 m S7 freestyle events, as he had done in Athens, and picked up medals in butterfly and medley events for the first time, winning silver in the 50 m S7 butterfly, with a European record time of 32.24 seconds, and bronze in the 200 m individual medley SM7. In the 2012 Paralympics, within the S7 category, Walker is participating in the 50m freestyle, 100m freestyle, 50m butterfly.