Thanks Gents ...

It does make sense about the rear pushing and other components wearing. They gave me such a cock and bull excuse this morning, so the money is back in my pocket. I've had 6 trips and gave them 4 attempts to fix it.

Would it be worth getting somewhere else to check it to see if they had fucked it up or user error? It felt fine and drove in a straight line before the had a go with it.