Thanks for the advice NHE and Ryan it's helped lots. To keep you all up to date we reserved the property yesterday and now have 28 days to exchange. It was written into our reservation agreement that we only need to exchange on 1k and the rest is due at completion. Completion is Nov-Dec so my mortgage offer (assuming we get one!) will still be valid and we can take advantage of Halifax's offer to pay stamp duty for FTBs which will save us a couple of grand
We also got them to include all flooring and kitchen appliances so that the house will be ready to move into. I'll keep you all posted on my experiences going forward