Thanks, well the interior was looking good then, but now not so much now. The exact headlining I bought was Cream Brushed Nylon Foam Backed Headlining 3m x 1.37m from AS-Trim.co.uk. I used a spray adhesive, which is now not so great, as its now started to sag. Also unless you get a great seal on the windows, and drive the car regular, go for vinyl, as the lining will get damp. That's mostly down to me though, as my one window has a great seal, I just need to sort out the other side.
Honestly though I don't know what the best adhesive to use on the headlining would be, but if like me you sprayed primer on the inside, you need to roughen up the surface for the adhesive to get a good grip.
When I get chance I will probably be changing mine to vinyl, although not so easy now its on the car. may have to cut the roof off and start again
