Where can I find Shower trays in Heathrow?

Shower trays can also be found in these cities:

Brentford Epsom Greenford Harrow Hayes Isleworth Kingston upon Thames Leatherhead London Slough Twickenham Walton-on-Thames West Drayton invalidcity

You can also find this in Heathrow:

Radiators Drainage Showers Shower Enclosures Shower Enclosures