Hi everyone - sorry that more of you haven't completed by now.
My vendors sent me a copy of their email chain and that did help us speed things (although he wouldn't admit his solicitor was a bit slow passing things on).
I am very pleased to have moved- and so far away. First the buyers seem to keep trying to get money out of us, first for "professional cleaning", then we got a request via the Estate Agent that a third party was wanting us to get the hedge between the house and the public path next to it cut. Both requests have been turned down - but I'm very relieved we don't have to deal with the new owners. (And they got a big discount on the purchase price in the first place, plan to do lots of rebuilding and we were inconvenienced on numerous occasions by surveys and architects).
Good luck everyone and I hope things don't get too much more complicated.