We finally exchanged and then moved on the 29th November, after a year of hell, I think I mentioned a few things about it in this post a while back.
Im sorry that your buyers are being like that, it's such a stressful time and you just want it over with.
Whatever you do, don't move yourself, or if you do, get the right size van. I got 5 mates to help me move with a Luton and tail lift, and somehow grossely underestimated how much stuff we had. Ended up with a fully loaded, top to bottom, front to back Luton and almost half a house worth of stuff. Had to call a man with a van to help and still did another 4-5 trips in his. Luckily the house was 1 min round the corner.
We had ran out of money by the time we got to moving due to having to pull of out of a previous house due to huge issues with it. But quotes we were getting were around £1000-£1500 in Hastings.
I wish you all the best with your move and hope it goes as best as it can without further delays.