Quick update on this: I fitted my new glow plug relay and they are now fully functioning with the light on the dash also working to my surprise. Wound the max fuel screw way out and cracked the fuel lines at the injectors. Turned the engine over, wound it in a bit, turned the engine over etc etc until I could see fuel. I then tightened the fuel lines and with a few more small turns of the fuel screw (the engine needed a bit more than a dribble at the injectors) the engine is now idling nicely.
However, I have no throttle for some reason, even when I push the throttle arm to its stop, the revs don’t change, any ideas? Sure it’s something small I’ve not tweaked or something. The engine also seems to creep up the rev range when it’s idling for some reason?