OP, tell your estate agent that you want them to only put forward buyers who have mortgage offers in principle / have demonstrated proof of deposit etc.
Agree with this 100%
Welcome to the wonderful world of house buying and selling! It happens from both sides, we’ve been on the receiving end of this flaky behaviour from buyers and sellers.
When we bought our first house, we were extremely keen. Paperwork sent on time, finances sorted etc. Our sellers were apparently after a ‘quick sale’, and planned to move in with family after the sale - great! No chain! Until 2 days before exchange when they told us that they’d now found a house they wanted to buy so could we put things off until that had all gone through? Oh, and the house they wanted to buy was in a chain.
Fuck. That.
When we sold, we had a realistic offer from a couple who were downsizing (so no mortgage issues). They then proceeded to nitpick about every little thing, until they pulled out a week before exchange when they had badgered us and badgered us the exchange by X date.
When we put the house back on the market, we received a lower offer from a family who were ‘in love with’ our house. They then retracted the offer the next day. We later found out that they had offered on THREE houses on the same day, and wanted to see which offer was accepted.
It is absolutely infuriating - you have my full sympathy. We spent the whole of 2017 selling our house and the stress of it all is quite overwhelming. It’s put me off buying/selling for a long time now.