An update - after some more unreasonable requests (including saying they were reducing their offer by £24k), a couple of days before we were due to exchange contracts they pulled out from the purchase . However, the lovely young couple who had put in the 2nd best offer weren't fixed up and we've sold to them now. We now won't be able to take advantage of the stamp duty holiday, but at least we now have reasonable purchasers.
Mysterious hole - help please!
Being quizzed by chemist's assistant in Boots.