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Here's you're answer.
(I had to completely rewire my boiler / water / heating when I went smart)
Flameport.com has some good wiring diagrams if you need them - mine was s-plan, yours may obviously vary.
NotThamesWater
Grumpy_Git
The not smart bit on my smart thermostat system.
Sigh this is the nearest the previous owner/installer got to fitting a proper wiring centre.