hi and welcome....depending on the thickness of that tile you are on the borderline of using a dispersion adhesive ( tubbed ) and using a cement based one ( powder form ).
you will get white star at CTD in edinburgh.
Ceramic Tile Distributors .but i would recommend using a single part flexible powder adhesive....prime the board with bal bond sbr ratio 4 parts water to 1 part sbr...use a 6mm trowel and back butter tiles to achieve a solid bed fix...fially grout with a flexible wall grout.......