Click on rear Seat Conversations on the left of screen.
The row of three seats you see bottom right of screen (double & single) just over a year ago cost £650 fully fitted as you see them. I know they have chairs in stock.
There are people nearer to you in Cornwall. For example in www.vwconnections.co.uk who are just outside Truro. A number of the members on here rate the guys there very highly, but I don’t know if they supply chairs or not.
Hello and welcome to the forum. we can supply and fit you a triple seat conversion for £750. That will be a seat in either inca or grey vinyl. £50 extra for full height backrests. alternativly try eBaY.