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As @Sam_w says the subfloor must be pretty perfect. Basically because it's vinyl if there are ridges/bumps in the floor it will affect the flooring; worst case scenario it could, over time, crack a bit like a credit card in a wallet that is subject to repeated stress in the same place.
Karndean installers will, to the best of my knowledge, ply line, then put down self levelling and then put a specialized feather screed on top only then do they lay the floor. This produces a floor that is pretty much flat enough to play snooker on.
Bobbo
Cheers. I think that was one I was thinking of. It's only 6 sqmtr so price shouldn't be too bad. Whatever we get will be going over floorboards. What's the procedure there, put down some ply or underlay or something to cover the gaps/imperfections?
I probably won't be doing it myself (it's not my house) but I'd like to understand the basic process.