Good luck Dobby!!
Things are moving very quickly for us, at least they were until some news came through yesterday. Basically to sum up (as I haven't posted for a couple of weeks) we have a cash buyer buying our house and the house that we are buying is currently rented out, was an inheritance to three siblings and was rented for two years, their tenants are buying their own place so the siblings decided to sell. All seemed very straightforward 
Anyway, our house sold two weeks ago and our offer was accepted on the new house a week ago. We had an AIP already from Santander and our broker sent the full application a week ago. All seems well, they said it is all in order and have now arranged the valuation, so we are positive that all will progress ok on that front, hopefully get confirmation by the end of this week.
Our solicitor rang yesterday to say that one of the siblings has sadly passed away (not sure when, there were three names mentioned on the sales letter, but only one brother and sister were mentioned to us by EA) so the house is in probate. Solicitor thinks this will delay things but no idea for how long.
Tbf we knew it all seemed too straightforward 
We have arranged a homebuyers survey too, not sure if it was wise but Santander didn't charge any fees at all and we had budgeted for the mortgage costing 1k in product fees etc so figured we had the money for the survey.