ben sturnham is a rugby coach now i belive and played high end rugby for a few years, used to race for shumacher and tanaplan and should of had a worlds podium once
william mitcham now races caterhams with his father, won a national championship with t tech and had a pred named after him
paul whitaker was a top speedway rider and shortlisted to represent his country a few years back but injury forced him out had a national a final or 2 from memory running shumacher cars,
nick damon, used to race regionally and nationally in offroad and 12th many many years ago, now presents on motors tv promoting the rc world
dare say there are loads more as well, they are just 4 off the top of my head