We put in an offer on a house, which was accepted. The seller then said that the extension they built should actually have had planning permission (their HIP had said it wasn't required).
They say they only just realised it, that they've called the council and put in an application now, and it'll all be sorted out in 4 weeks. They've said they're happy for us to wait to pay out on surveyors etc til it's sorted.
Is there any penalty for having a wrong HIP? And what would you do?