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I just bought a LoftZone kit (raised legs and metal channels) and OSB T&G boards - for 3.6*3.6m worth, came to about £400 (plus another £100 or so for insulated loft hatch and a ladder).
The outlay for the boards and legs could arguably be double that if you want to board the whole thing - but could always insulate it all and only board some of it.
We got lucky with respect to the extra 170mm insulation having been added about ten years back via a government grant/scheme of sorts.
👍
How much did it cost in the end?