Hi Franklin,
I know you asked Determine but I am going through it right now so I'll give you me experience if you don't mind.
After you have been pre-approved the council send out a surveyor and valuer to your property to check it. Once they have checked it you will get your final approval certificate. When you get this you will be asked to get the property checked by a plumber and electrician to make sure there is nothing seriously wrong with the wiring and the plumbing. They will do up a report stating what needs to be fixed, if anything, and they have to give an estimate of how much the work will cost. You need to send this into the council asap. While you are doing this the council will have sent the file to their solicitor who will start work on the contracts.
I don't want to worry you but I was 10 weeks just waiting on the surveyor to come out so don't hold your breath waiting for the contracts! I have been involved in this process since February and the solicitor is only now starting work on the contracts so it's going to at least another 6-8 weeks before we close. You never know you might be lucky though but make sure you keep hounding them.
Good luck!