For that price??? Yes.
Most of those old motorhomes had woood frames for the box part. They were also prone to water leaks. Once the water gets in, it rots the wood frame. Maybe this is one of the few that didn't leak, and if you see any water stains or evidence of water damage, walk away.
That 6 cylinder engine won't do you any favors either.
I would imagine that you could find a newer motorhome for that price, or slightly more. I don't know what prices are like in the UK for motorhomes. That price just seems high for something of that age.
If there's no wood rot, one of the positives is that this thing is low tech, and you don't have to worry about expensive computers, etc when it comes to repairs.
Look it over very well. Get up on the roof and look for signs of damage and quick fixes like caulking stuffed in holes, etc.
Good luck.