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Laid these cork tiles last year
https://www.colourflooring.co.uk/products/lasca-cork-flooring?_pos=2&_sid=dc0fc0bbb&_ss=r
They’re great underfoot but they have bleached quite badly in the sun, luckily in a gradient from nearer the windows to back of the room so blends in, though some big marks on the floor where the back door mat was. Something to think about if you have regular sun lying somewhere for an extended time
Yeah I had to level mine with a screed. I think it’s pretty flat now, 2mm deviation max.
These ones come sealed with a wax finish. They can be sealed again or periodically using a whole load of different things. Just brush it on then wait for it to dry.