what is the wall build up?
Ideally if stud the plasterboard will be the correct type e.g. Gyproc Glasroc H Tilebacker or some other proprietary tile backer board. You can tile onto this.
If solid wall you can tile onto the render.
No rubber linings required but make sure you use waterproof adhesive and finish off with waterproof grout and sealant at perimeters
Edit. FYI B Regs documents (Wales & England) can be downloaded here[/url] but I don’t think you’ll find them much use for what you’ve just asked.