Did you try those We buy any house companies.
At least you might be able to either walk away with something or even just have a managed loss.
My worry is that you could find your normally £250,000 flat for example, that you have a £200,000 mortgage on goes to auction and fetches £75,000. If there are such huge problems then the person taking a chance on it isn’t going to be offering anywhere near enough to cover your mortgage.
WBAH type companies might be able to offer you something nearer your needs or at least have a sort of manageable short fall that you can come to some arrangement with your mortgage company
I would check out blocks of flats similar to yours around London. I have seen a few up for auction with Cash buyers only noted on the particulars.
See what they have gone for and what they were bought for.
I would spend a day doing some research as just handing your keys back and thinking that is the end of it isn’t what is going to happen.
At least atm you are in control and can come to some sort of agreement and mitigate your losses.
Once the mortgage company are in control they don’t care. They just want the place off there books and won’t care how big a figure you owe.
I read about this type of thing happening when I saw perfectly nice new flats saying cash buyers only
Apparently all apartment buildings have to be surveyed. The likelihood is that yours is perfectly fine but there are only something like 3 people qualified to do the surveys for the whole of the uk and it is going to take some time to get through everyone.
I would add up how much costs there are in keeping the flat going over the next, 5 or 10 years and knocking that off the price of the flat if there wasn’t anything wrong with the flat and you were selling it normally. Then knocking another £10-20,000 off as the cost of replacing the cladding if it was deemed unsafe.
I would have these figures on hand if you decide to try to sell and need to haggle over the price.
FWIW we are on our 3rd mortgage holiday since March.