Thanks @MitchellMc There is waterproofing membrane underneath the floor tiles (besides the exposed bit and underneath / behind the shower. I will seek ...

Thank you @CSParnell

Thanks @TedBear - I pondered on mortar but ideally wanted something that was not porous as a washing machine would be sitting immediately above it.

Thanks Mitchell, Much appreciated on the fast response. I pondered on cutting tiles but don't have any of the tiles left and would love to avoid a mix ...

Hi all, I have a 70 mm gap between tiles and the shower due to the installation of a new shower that was smaller. It's too small to add tiles and too ...