Update. Seller has asked me for another 50k or it's going back on the market. Pretty gutted to be honest and it's starting to take a toll on me, this being the second time things have collapsed.I wont be far off that soon! The seller would probably be ok with me starting (Not sure if he thinks I have!) but I was burnt by the last house I was buying collapsing and taking with it the money I spent on searches etc.
Definitely taking this one slower.