Afternoon all
Today I had some time, so went around to my sons to try & get to the bottom of what is going on with the fridge.
I took off the cover/fascia on top of the door revealing the wiring loom from the main body into the door which travels along the top hinge.
After also removing the fascia on top of the fridge which conceals the loom into the fridge, I noticed that one of the wires had broken (a white wire).
So after finding both ends of the wire and soldering back together, and putting it all back, the fridge is in full working order.
I assume that the wire was almost broken, and thus moving the door made enough of a connection for the fridge to spring into life temporarily.
However upon dismantling, it probably came fully apart.
Anyhow, hopefully this may help someone in the future.
Regards & Thanks
Simon:D