So an update

Checked the relay and any fuses with the glow plug icon on the fusebox lid and all are working.
Tried starting the car up missing a fuse or the relay and no change, the car started just fine and the glowplug light stays on for 15 seconds and the dials wont function until it goes off.
Except on one of the startups when the light went off after a couple of seconds and the dials started moving, but only for a second before the dials froze in place.
I then realised I had hold of the key still and I turned it ever so slightly clockwise, as if I was going to start the car, and the dash dials and lights changed again.
Seems like there is a bad connection in the ignition barrell that's maybe causing this issue and nothing to do with the plugs at all!

Now does anyone know anything about ignitions......