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Here's some pictures of the current setup. After talking to a friend, the thought was that the brown wire is live and should therefore be connected to 'A' on the THR870C and the black wire that's attached to terminal 2 currently should go to 'B' on the THR870C. If that's right the loose...

I currently have a Siemens RWB29 Programmer attached to my boiler. There is also a Siemens rotary dial room thermostat which isn't working very well. I have got myself a Honeywell THR870C to replace it. Unfortunately I'm having trouble working out what the wiring should be. The THR870C manual...