The boot liner kit has arrived. I ordered a 3 x 2 M section of stretch carpet and 2 cans of adhesive for just under £30 delivered. I could have bought a bit cheaper, but I went on recommendation/review in the end. The adhesive had some good reviews due to its max. temperature rating (120 deg. C).
The carpet is actually a little thicker than I expected, which is pleasing:
I've got a small mountain of work to clear this week, so it will almost certainly be the weekend now before I even look at it all again.