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Thanks everyone so far for their assistance. Unfortunately I am not at home but after a quick search online it looks as if the thermostat is a Siemens RAA20 Room Thermostat which does not require a neutral in its installation. Looking briefly at the wiring diagram of the boiler I can only...

Gunslinger, you are correct in the type of thermostat and yes it only has 3 connections (I got carried away in my original post!)

Apologies if something like this has been posted before but I have done a search and cant seem to answer my problems.... Our current boiler is a Ravenheat LS80 Combi boiler (Don't worry I am aware of what they are like....) This is currently controlled by a siemens room thermostat with 3...