Do BAL have an adhesive for tiling on to bonding plaster?

Unfortunately, BAL do not have a suitable tiling adhesive to be used on to bonding plaster.

The main reasons are:

Bonding plaster is relatively soft and porous. It isn't designed as a tile-backing substrate, so the adhesive bond can be weaker than with a suitable tile backer or cement-based render.

It can absorb moisture. In bathrooms and shower areas, moisture can penetrate the plaster and potentially cause deterioration, loss of adhesion, or mould-related problems.

The surface can be dusty or weak. Bonding plaster is often finished with a relatively friable surface. If the adhesive bonds to a weak layer rather than the underlying wall, the tiles can eventually detach.

Heavy tiles are a particular concern. Large-format or stone tiles put greater load on the substrate. A plaster surface isn't generally the substrate I'd choose for these.

Wet areas need additional protection. A bonding-plaster wall isn't, by itself, a waterproof tanked substrate. A shower enclosure normally needs an appropriate waterproofing/tanking system behind the tiles.

Plaster has limits on tile weight. UK tiling guidance and manufacturers commonly specify maximum tile weights when tiling over plaster, and these limits depend on the particular plaster and adhesive system.