Congratulations mystic!!! Must be such a relief 
There is a small chance we might exchange on Wednesday....
Spoke to our EA and solicitor again yesterday and they are a bit concerned that the investment buyer at the beginning of our chain offer expires on 21 August and our already extended mortgage offer expired on the 22nd.
We have a crazy long chain (8 or 9!) and we are pushing to get exchange for all sorted in time. However there is a search still pending for the new property in the middle of the chain and a few solicitor bits that will take a little while to sort
Looks like we are running out of time 
So EA is speaking middle link to see if they found rent/stay with family for the sake of just a couple of weeks.
I'm not sure they will - when they pulled out of the first house they were buying (which was fair enough due to structural problems) their EA told us that they would rent so advised us to hold fire - turned our to be not true though.
We managed to get one last extension on our mortgage but natwest made it clear no more extensions - we would have to apply all over again (plus pay the fees again) and even if we did get a new offer under the new mmr rules it would take another 6 weeks at least to get the new offer.
Would be too late then for school admissions too (which is the whole point of moving!) so if we can't exchange next week we will have to pull out 