I have just moved into a new house that has a british gas WR1 Wireless System on the wall by the boiler, thanks to the previous owners they miss layed the programmable room thermostat, i need to purchase a new room thermostat but not sure which to get, i've read that all BG WR1,RC1 operate on a frequency of 433mhz. The drayton programmable room thermostat runs on the same frequency, could any1 tell me if this is true.