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Behind the old thermostat was them 3 wires in the diagram including an earth. The black wire with a blue sheath and has been capped off (?) as instructed for any wires not in use.

The boiler will be on depending on the programmer. The nest doesnt seem to make any difference.

The programmer is a British Gas model UT2. The NO is a grey wire with a brown sheath, as is '3' on the programmer. I should of made that clear on the diagram, apologies.

Hi guys, as the title suggests, all other threads seem to be about the 3rd gen nest and not the 'E' version so I've created a new thread. I believe my old thermostat never worked as the wiring setup didn't match the diagram on the the inside cover which I discovered when installing a new Nest...