OK - I'll take a look at the bolts and the ease / diffculty in turning it round every so often. We also needed the seats to be flattened - one company quoted me £600 for this alone.
So - I'll take in all the insight and have a think.
Thanks

OK - Thanks everyone for the replies and links. It's stil as clear as mud but in the end I need it to be safe on the very odd occassion when we carry family in the back.
The MOT station seemed very clear on that if it didn't have belts for the rear seats it could only be registered as a 2 seater ...

Hello.
Our '97 Bongo was converted to a camper last year with a rear kitchen unit and the middle set of seats reversed - to make make more of a lounge area, which works well.

An issue highlighted when just going through its MOT was that there are no seat belts now for this rear facing set of seats ...