Yep, I've had exactly the same issue!!
Bought my wheels, put em and and it went up silly money for a set of wheels. unfortunately, I only had three more months to go so had to sit and take it (or loost the NCB for this year) so I won't be staying with them!
Will go off to DL if I need to, they underwritten by same people, normally about £50 dearer per year but more mod friendly by all accounts!