Thanks @Airhead and @hugo7
What about this cork stuff someone (possibly @chrisbmx116) recommended in the past, installed floating rather than glued: https://www.colourflooring.co.uk/collections/cork-flooring/products/espira-corka https://www.colourflooring.co.uk/pages/corka-installation
Instructions there suggest mechanically fixing the hardboard (screws). It does mention a moisture barrier if installing over concrete but presume covering the whole room in hardboard would negate this?
Have you considered trying to feather out a screed to lose the height difference between the two surfaces?
It's onto floorboards. I don't know enough about types of screed but is there one flexible enough for that?
@Bobbo started
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Thanks @Airhead and @hugo7
What about this cork stuff someone (possibly @chrisbmx116) recommended in the past, installed floating rather than glued:
https://www.colourflooring.co.uk/collections/cork-flooring/products/espira-corka
https://www.colourflooring.co.uk/pages/corka-installation
Instructions there suggest mechanically fixing the hardboard (screws). It does mention a moisture barrier if installing over concrete but presume covering the whole room in hardboard would negate this?