It is recommended in BS 6262-4, that glass in bathing areas (e.g. bath, shower screen, swimming pool, wet areas, constitutes a potential danger because of the possibility of a person slipping on a wet surface. Such glazing should consist of a material recommended for bathing areas in BS 6262-4.
Glass for prefabricated shower enclosures and shower cabinets should also conform to BS EN 14428.
[Reference: BS 6262-4: Glazing for buildings - Part 4: Code of practice for safety related to human impact]