Now I realise from reading other peoples posts that actually our situation is fine but just wanted to share 
We are in Scotland BTW.
Had our offer accepted about four weeks ago on our first house so we went back to the lender we had been dealing with for a DIP and started the full application then 1 week later the lender said I didn't tell them about default on my credit file (I did because it is part of an ongoing complaint and I took all my info to the first meeting we had) so they declined our mortgage application 
We managed to get an appointment with a broker who said no [problem we will find you a mortgage, they did so we are very happy except we have still not had the official offer. Broker phoned yesterday and told me it is because the seller of the house has used a surveyor who is not on the lenders panel so they cannot use the HR or the mortgage valuation provided! The broker has already spoken to my solicitor so he is dealing with that but I need to phone him today because he is concerned about the titles as the boundaries are incorrect and the sellers solicitor has not got back to him about it yet.
We are supposed to get the keys a week on Friday! Somehow I don't think that will be happening, luckily we are in rented and haven't yet given our notice (I didn't want to until we actually had the keys) so no panic from that point of view. I'm just frustrated because I want to go see my new house and start the work it needs immediately!