Weigh up the risks versus rewards?
Iirc March to May are when the vast majority of properties go on the market. So, if you don't get your arse in gear and make alternative arrangements, there will soon be a lot of competition on the market.
It would only take maybe a slightly better kitchen or garden to break the deal.
Mortgage rates have gone up significantly since last year. They're probably pissed off that there is no end in sight AND they're going to have to pay more if the sale doesn't complete. I know I would.
From 1st May, fyi, there will be no such thing as a fixed tenancy. So, you could move on 30th April and on 1st May give 2 months notice to quit on 1st July.
I think this summer is going to be a bloodbath with lots coming to the market and not a lot selling, personally.
It's not just mortgage rates. It's in the news today that food inflation is predicted to increase from 3.5% to 9% later this year. The BoE were allegedly factoring in two cuts, but now the markets think there will be FOUR interest rate rises, which means they think inflation is going to go through the roof. Ofc we already know that energy is going to go UP in summer instead of down, and petrol is £1.50 a litre.
It makes for very uncertain times, which makes for nervous buyers.
If it were me, if I had a buyer who had waited all that time, I'd bend over backwards to accommodate them and keep the sale alive.