Not the easiest of tasks, and one I had been dreading.
Lying on my back, I wedged the lining above the rear screen hole using strips of foam rubber so the lining was in the right place and defying gravity.
Then I clipped the lining above the open windscreen hole using clothes pegs.
Then I marked the perimeter with a pencil, half at a time. Then I cut along the pencil line with ordinary scissors, spray glued the roof and lining, waited for 2 minutes and pressed into place.
Then repeat for the other side.
This is as much for me to remember as anyone else as I have 4 more to do.
Not as difficult as I imagined and a new headlining looks really good. The material is foam backed vinyl available from Banks. There was enough left to do the two strips down the front screen pillars.