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I've got this thermostat in my hot water tank, and I'm trying to determine which colours are linked to Common and 1 - either blue or brown - so I can link it to a Nest thermostat and Drayton HW Valve. Earth is self explanatory. The attached images show how it is wired currently, plus the wiring...

I have a Vaillant TURBOmax VUW 242 combi boiler - approx age 10 years old. In the past few months we have noticed when having a shower that the boiler will kick in and out at random; sometimes when water is being drawn elsewhere in the system (e.g. tap, dishwasher, washing machine etc.) or...