Nice one! That's a great help.
You'd think they'd put a place for the earth to go (rather than loose), everything else has been designed well enough.
Also, what's the grey wire?
Sorry to ask another question like this.
Can someone help with mine? It doesn't look like any other setup pictures.
The live is looped from 2 to 3 and the black is going into 3 (not sure what that wire does exactly, it's marked "call")
It's from a Drayton Digistat SCR going into the Vaillant...