I had a meeting with the solicitor today and got some bad news with the purchase.
In short I seem to have a knack for finding badly written leases.
The vendor has filled the gaps by offering indemnity and insurance policies but it doesn't put me in a good position should I choose to change mortgage provider or sell on.
So I've asked for the lease to be rewritten, the money to come from knocking the asking price down by the required amount.
However that will take time and because it's been 8 months since this started I need to find out if the market has changed. I may be able to find a better property now, in which case I needn't bother continuing with the current one.