We had an offer on a house accepted 2 weeks go. Our formal mortgage offer came through subject to valuation, but now the banks valuation has come through £20k lower than the offer.
Our sellers aren't depending on the sale going through for their move, so I'm preparing to have to walk away. We have some savings we could use but not the full £20k. Would it be perceived as really cheeky to ask to reopen negotiations to see if they might meet us somewhere in the middle?