You may well find cheaper and better options at this page:

http://www.tlc-direct.co.uk/Main_Index/Wiring_Accessories_Menu_Index/White_Telco_Index/Wiring_Accessories~Dimmers_5/

I have been looking for IR dimmer switches and these came the closest to what I wanted (sadly, the 250W limit for 2 gang switches is too low for my needs). IR-wise, you can program them to operate using any remote code of your choice. Another (expensive!) option would be the Lutron Telume from various dealers like this one:

http://www.cyberselect.co.uk/HomeAutomation/Products/Telume.html