Thanks chaps, always nice to get some encouragement.
@gstuart: https://www.ebay.co.uk/itm/175106855272?var=474291051078
This was the most reasonable priced stuff I could find on ebay. I bought 8 square meters and it came with some tins of adhesive. I'll need to get some more adhesive though, it's nowhere near enough for that amount of fabric. It's easy to work with and looks pretty good. I intend to redo the headliner and the back of the cab around the window with it as well.
I might be being a bit heavy handed with the glue but it didn't soak through. You need to spray both the fabric and the surface you're sticking it to then wait a minute or so for it to go tacky. Then you just press the fabric onto your surface, shaping as you go. It sticks quite well so you need to be careful as it tears if you need to pull it off again if you make a mistake. It's not been too bad for me so far as it's mostly flat surfaces I've done.