A little update
I rang the dealership first thing this morning and said that having spoken to mobility they agree that I should not be charged the collection fee ( yes I know its a bit of pork pie) . The dealership then agreed that ‘on this occasion ‘ they would drop the charge but if I bring it back another year then they will have to charge as thats the new policy . I agreed that if I bring it back next year I will pay. No chance! I change the car in March so I will have a different brand of car then so not going back to them anyway.
Thanks to all for the advice .