We went for a test drive in the car earlier and it drives fine. Biggest concerns really are no old MOTs and no service history past 44,000 miles. The price has taken this into account though considering similar cars from other garages with service history which cost around £1k more.
Found out the warranty is provided by Motorplan and it seems to include a large majority of items - whether they honour this when it's needed is another issue though.
My gut is saying to walk away :\
yep walk away, could have been clocked and the seller is trying to hide the history, cars a serviced for a reason walk!