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Again with half an eye on future condensation, I used sprayfoam insulation, a DIY kit. It suited me to do it myself, whilst saving myself some money it is was probably 50:50 whether it would have been worth getting a professional in. Anyway, the tanks were warmed up courtesy of Tony on Highlander's bath, and it went in OK, even under the floorboards in the outer thirds of the floor (some of which may need to come out for ballast in time). I wasn't sure how easy it would be to cut out the surplus, but a large panel saw did the job fine, which meant I could really go for it on the second pass.
It's made a huge change - the boat is now of course warmer, reatains heat for longer - and also quieter. It sounds like other people's boats, rather than a tin box, which of course it was.
I've started on the lining itself, putting in the boards under the gunwhales first. Some of the sheets of ply have got water damaged whilst on the roof (I actually couldn't get them inside until the flimsy front wooden doors were actually taken out completely), so the worst bits have been placed whether they won't be seen when fitted out.