Just answered my own question lol
I thought sod it and as it's a nice day I took a trip over to my Enfield dealer and he had a Brown one in stock. Yes it matches the rear seat and only takes a few minutes to fit.
There are 2 x 10mm bolts under the seat where springs would be if you had them. Just undo those and lift the seat off from the rear as it has a tab that slots in at the rear of the tank. A short 10mm ring spanner is best as those handles on the side get in the way. Once you loosen them just press down on the seat and you can undo them by hand.
As for the pillion/passenger seat it stays there and fits with the low seat.