We want to replace our flooring in the cloakroom/powder room (which at the moment is slate). The builders installed the slate which runs throughout the entrance hall (photo attached), kitchen and downstairs cloakroom. Having found bits of tile in the garden ( in builders rubble - it's a new build!), we believe it must be around 12mm thick. This is also based on the levels when carpeting the living room which runs off the main entrance hall. At the moment we are deciding between at a porcelain tile which is just under 10mm thick and a Kerlite porcelain tile at just 3mm thick. We will be also tiling the walls with the corresponding tiles.
Is it better to remove the slate tiles or tile over the top? If remove what would be the best method of removing the slate please?
Is it better to remove the slate tiles or tile over the top? If remove what would be the best method of removing the slate please?

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