Following on from the previous thread the whole thing looks to be a confused mess.
(1) Some sources say that BC cannot take enforcement action after 12 months have elapsed.
(2) Other sources say that an indemnity policy can be taken out to cover any costs the purchaser may incur due to lack of Building Regs approval. The kicker on this is that the policy is invalidated if anyone asks the council about BR approval.
I can understand that they wouldn't want to issue a policy if someone had asked the council about BR and established that it hadn't been given because this would be an invitation for the council to inspect, with a strong belief that costs would be incurred against the policy.
However this could be even more complicated if a 3d party enquired about BR approval (not unreasonable if more than one person is interested in purchasing a house). An enquiry could have been made without the vendor or purchaser knowing. Where does the policy stand then?
Anyway, most Internet sources suggest that there are loads of properties without BR approval and BC may not be too keen to know about it.
Cheers
Dave R