There are several organisations which will carry out an inspection, check ADs are complied with etc. For a few hundred pounds I would certainly use their services before purchasing an aircraft.
It could be someone lost the log books - it could be something is being covered up, how would you know?
For info the aircraft is G-BBRA
A little research shows a large number of changes in ownership during the 90's, could be how the log book got lost, could be why it is for sale (yet again), though it seems to have been with the present owner for the last 10 years according to the G-INFO website.