We are buying our first house in the UK, we found the perfect one, made an offer below asking price, accepted. Long story short, sellers are moving to a new-build, left the house to a 3rd party (move with us) as part exchange (or assisted sale, I’m getting inconsistent info). My solicitor made me aware that if we won’t get a fixed date, their house could be delayed beyond our mortgage expiry, plus we would be paying for an insurance on a house where they still live in. 3rd party solicitor, said NO to a fixed date, they will only exchange with “notice on completion”, sellers will not move to a rented accommodation. Estate Agent says that sellers are checking the progress and their house should be ready August, early Sep the latest. In the memo of sale I have Sep/Oct but new person from this 3rd party said she had November. I don't even know what the long stop date is. They want us to exchange within 28 days but that would mean we are locked, just waiting for the builder to finish with no indication whatsoever. The house is really nice and essentially it does tick all the boxes for us. Im torn between walking away and just exchanging and hoping for the best. Any thoughts?