Ben,
My mate Spud had EXACTLY the same problem the other day. he fixed it himself, with some parts from auto ellecy. BUT since then he snapped the shaft of his motor yesterday!! so he might have the sh$ts with the lot and sell you his foot pedal
I will check with him, what and how he fixed the problem, then I will PM you his number...he can explain. Hes at Cania at the moment.
Not good when they pack it in after 1 year. bit dodgey. He has had a few other issues too I believe.
Cheers Steve