Simpson is a wicket-keeper and left-handed batsman who won the Denis Compton Award in 2004 at Lancashire, and 2011 at Middlesex.
[2] In 2018, he played for Brothers Union in the 2017–18 Dhaka Premier Division Cricket League in Bangladesh.
[8] In January 2024 Sussex named him as captain, initially for the first seven County Championship matches.
[12] Simpson is the grandson and great-grandson of two former professional rugby league footballers who were regarded as two of the best fullbacks in the game at their times.
Simpson's grandfather, Ken Gowers (Walter's son) was the outstanding fullback for Swinton from the 1950s to the 1970s.