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Thanks for the quick reply! I'm glad it's not just me who that the extra wire was odd. I'll trace it back tonight when i get home and post a pic if I can, and check if L is linked to 1 but I'm fairly sure it isn't. There's no existing room stat - the boiler is in the loft and has an old...

Hi! I'm about to replace an old timer with a wireless thermostat. I've taken the old one off the back plate and see 5 wires attached. The installation diagram for the new one shows only four attached wires. Looking at the diagrams do I attach the extra wire (currently on 2, off)...