Because of the non-existence of a Dutch Moto3 championship and the small number of riders in the German Moto3, for 2015 Van der Valk went to ride with the new Moto3-team of Isle of Man TT rider Ian Lougher in British Motostar, a support series of the British Superbike Championship. Despite being new to Moto3 and not knowing the tracks, he gradually moved forward during the season and took some impressive 4th and 5th places in the end of the season. Overall he ended up 8th in the Moto3 Motostar championship, with him being the only rider to score points in every race. For 2016 Van der Valk switched to GA Competition so he could ride on a Geo-Honda, with Daniel Sáez as teammate, but after 4 races Van der Valk split from the team, unhappy with proceedings.
