Hace a look in AP. I have certainly seen a repairer advertising in AP who is Liverpool based( Ellis brothers?). OK Manchester is nearer but L'pool's not that far either. I can't say if they are Canon specialists.

Much further from Manchester but still within a couple of hours is a gentleman in Leicestershire somewhere with a Polish sounding name( Ed Tros...?). He is frequently mentioned in AP and appears to be very highly thought of especially in terms of older camersas.