Hi Bunslinger (Great Name!!),
The room thermostat is branded as british gas. It is about 3" square and has a central display with the temperature showing. There is a (non functioning)button on either side of the temperature display and a plus and minus button below for the temperature control. It takes 4 AA batteries. Does this help? If not I will take your suggestion of call worcester in the morning to see if they can sort it out.
Thanks!
Clare Bear
April 2009