Get a Marine Survey (or it's inland waterway equivilant) done before buying.
Apart from going over it with a fine tooth comb (as they say) the point's I would be VERY interested in (and requiring proof of condition) are:
In date Boat Safety Certificate.
Electrical Test Certificate (Consider getting it tested anyway).
Gas Test Certificate (Consider getting it tested anyway).
When were the anodes replaced.
Hull thickness (leads from the anode replacement).
Rudder, stock and associated bearings thickness & condition (leads from the anode replacement).
Prop condition (leads from the anode replacement).
Soft furnishings, are they fully compliant with the Furniture and Furnishings (Fire Safety) Regulations 1988/1989, 1993 and 2010.
Condition of the ropes / fenders etc.
Are the Fire Extinguishers in date and suitable for the Boat.
Are there any Life Jackets, and if so are they in good working order and suitable for the conditions the Boat will be used for.
This posting may have been helpfull, on the other hand probably not... Either way, I may have had drink when posting it in which case it's probably not as helpfull as it could have been
Work safe, and remember all technical problems can be resolved with a hammer, the trick is knowing where to hit it and how big a hammer to use (I often find it may also help to have a spare bit in the shed to replace the bit you have just mullered

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Work in Progress (or not as the case may be) I give you....
'O-no' the truck.Comments on 'O-no' the truck may be left
hereWork in Progress (or not as the case may be) I give you....
'Truck'Comments on 'Truck' the truck may be left
hereOwning a 2.8 is a hobby in it's self...