Anstey returned to the Isle of Man for the Classic TT Races in August, 2017. Practice saw him amongst the higher end of the field prior to his opening race, the Dunlop Classic Lightweight TT. On a Honda RS250R, Anstey lead the field from the start during the four lap race, breaking his previous year's lap record, becoming the first 250 cc rider to pass the 120 mph barrier, recording a fastest lap of .
