British Standards Institution
Always check for the most up-to-date version of the standard

BS EN 251
Shower Trays: Connecting dimensions.

BS EN 14527
Shower Trays for domestic purposes. 

BS EN 249
Sanitary appliances. Shower trays made from crosslinked cast acrylic sheets. Requirements and test methods.

BS EN 15636
Sanitary appliances. Shower Trays made from impact modified extruded acrylic sheets. Requirements and test methods.

BS EN: 15720
Sanitary appliances. Shower trays made from impact modified co extruded ABS/ acrylic sheets. Requirements and test methods.

BS EN 263
Sanitary appliances. Cross linked cast acrylic sheets for baths and shower trays for domestic purposes.

BS EN 13558
Specification for impact modified extruded acrylic sheets for shower trays for domestic purposes.

BS EN 13559
Specification for impact modified coextruded ABS/Acrylic sheets for baths and shower trays for domestic purposes.