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if you can chopsaw legs yourself
Google images isn't throwing up any results for DIY equivalents.
Loft Zone say that adding extra joists puts too much weight on top. Obvs they would say that tho.
hugo7-
PIR insulation like Kingspan or Ecotherm is about twice as good as fibreglass roll for the same thickness. It’s loads more expensive, and needs neatly cutting so probably too dear if you’re paying an installer rather than DIY, but it could be worth running the numbers to see if 100mm of it between your existing joists is cheaper than 200mm of fibreglass and the fancy Loft Zone kit.
Hefty
I don’t remember the insulation itself being massively expensive. Shop around as the prices vary quite a bit and a lot of the chains put it on special offer. DEFINITELY get the no itch rock wool type, wear a dust mask and get some long rubber gloves to keep the fibres off your hands and arms.
As @eskay said, the loftlegs and loft board packs ended up being ££££££££. It’s far cheaper if you can chopsaw legs yourself and cut boards yourself from 8x4 sheet, but I didn’t have any way of doing this. The loftlegs are definitely a way more convenient way of doing it - great invention!