OK,

So im just trying to work out how to connect this new stat up (Drayton
Digistat 3)

Its got 3 wires, common, heat satisfied and heat not satisfied. Ideally i
would like to be able to just wire this into the timer control and not have
to do a run to the pump, as the pump is in a stupid position under the floor
and is a pain to get to. Plus there is no junction box, it seems to be wired
up by someone with a deathwish!! Its a Drayton Lifestyle lp241 controller.
Just wanted to check the following....

Im pretty sure that common on the stat can be put into to the "ch on" (pin
4) in the timer, but im not sure about the other 2.

Any help is appreciated before i have to pay someone to do it