County Hardtop Back seats

Dear All
I have a county hardtop and want to fit two seats in the back just behind passenger and driver's seats. Does anyone know if this is legal? I can't see a problem myself but don't want to go to all the bother if it fails next MOT because of some weird rule (e.g. can only have seats if you have windows along each side in the back).
cheers
nathan

I suppose it might not be noticed, they might just think they have always been there, I suppose it depends if the paperwork numbers the seats.

If you bought 2 land rover seats from ebay or paddocks I don't see there would be a problem.