tiling insulation board question (no UFH)

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1950s ex council house, solid concrete floors, about to have the ground floor tiled - hall, kitchen, utility and bathroom in 10mm porcelain tiles.

Hopefully it's not too silly of a decision, but to keep installation and running costs down, we've decided not to install UFH in most of it (but will have wet UFH in the bathroom).

I want to add a layer (6 or 10mm) of insulation (boards probably) to decouple the tiles from the concrete - I'm hoping this will just keep the ground chill off the tiles in winter.

so.... Is it even worth insulating if we're not heating? which board would be a good type? - there's an overwhelming variety of different board materials and constructions....

Thanks in advance! :)
 
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