"Nick Brooks" wrote in message
...

Hi Nick

I suggest you unscrew the existing thermostat and peek inside, how many
wires have you actually got in there?

I looked inside the drayton and this is what was inside

Blue wire to N
Red wire to L
Earth (green & yellow) to earth
Yellow wire to a terminal numbered 3

Secondly, what controls when your heating comes on at present as you may
need to consider how it will interact with the CM67?

The boiler has a timer on it but I understand that doesn't matter I just
switch it over from timer to to constant and let the thermostat control it.

Angela