Brilliant news for those who've exchanged.
Empress, the site manager thought he had time as completions were usually at 3pm. We rolled up at midday 
They were great .... As that van was only stuff for the garage we dumped it on the drive and then the builders carried it all into the garage whilst we got the rest of the stuff loaded.
Really pleased with the quality of the house. All snagging issues are fairly minor and the only issues we had on moving in were a dodgy tap which was fixed in an hour and the hob which the kitchen fitters had buggered up but was again dealt with by the on site electrician straight away.
I'm currently somewhat converted to new builds. 
Kappadelta, after eight weeks if they are still struggling to find a morthage provider I'd consider remarketing. Reassurance should be provided, the process takes longer if you're self employed, but I'd be worried if they hadn't yet find a bank willing to go through the motions.