Yeah I think I accidently touched the neutral and earth wire at one point as I hadn't isolated everything properly, which tripped the fuse board but then moved the wires and turned it back on and it seemed ok. Could I have fried the PCB in the boiler then by doing that?
Evening,
Having some trouble with changing from Drayton RTS1 to Nest E. Followed the nest app instructions and also https://www.diynot.com/diy/threads/nest-e-on-rts1-thermostat-british-gas-rs1.538439/ which seems identical to what I am trying to do!
So I've put black wire from 3 to NO on nest...