Woffinden became British Under-21 Champion in 2008. The event was held at the Arena Essex Raceway, with Woffinden only dropping one point in the qualifying heats and winning the final ahead of Adam Roynon and Ben Barker. Woffinden is the first rider to hold both the British Under-18 and British Under-21 title during the same season. He was also the first rider to be the British Under 18 Champion for two consecutive seasons. On 15 April 2011 Tai Woffinden won the British Under 21 Championship, held at the Arena Essex Raceway.