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Thanks for the prompt response. When i finally got it open I found that one of the wires wasn't making a good contact so I made it good and now it works. Phew:

The original was also Honewell but I don't know the model. A square box with a dial to set the temp is all. There are 5 terminals - from left to right - earth & 2 together (I assumed earth and neutral), then 3,4 and 1. The other two wires were in 3 and 1

I got it open: There are two tiny slots at the top of the battery compartment - insert a small screwdiver and Bob's your Uncle. Still not sure about the wiring though

I have just fitted this new thermostat but I am having problems. There were four wires in the original mechanical thermostat, one an earth, one (presumably) a neutral and the other two to switch the boiler. I have isolated the earth and neutral, and connected the other two to the A and B...