Ah, I don't mean that the BFTA card would buy you universal cover like say BASC or NSRA; it would ONLY buy you cover to shoot at BFTA events. Your club would still list you as a member and cover your activities at home and when on club sponsored events. If you want rough shoot cover then it's BASC or CA or NSRA etc.
So the amount of risk that the BFTA card underwriters - in this scenario - would be exposed to, is quite small. Only the time when you are at a BFTA sponsored shoot.