Huge roll of recycled glass bottle insuation (170mm thick) - £2 from Homebase (had a 50 mile round trip to find the nearest place with some in stock though)
Small strip of ply, to help stop the insulation falling down...
Pieces cut to shape, then pulled apart to around 90mm thickness and tucked into place...
Silver foil bubble insulation will be taped over providing a moisture barrier...
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