Right, i've just had a fiddle about with the fuses and relays in the 2 black boxes over the battery.
I stuck another fuse in and hey presto it all works again 8-)
So i closed the bonnet and the fuse blew again
Open the bonnet again, move a little wiring loom about a bit and gently closed the bonnet, put yet another fuse in and it's working again
I did all this at my dad's at shifnal and drove the 5 miles back to mine with no probs.
I don't know what them fuses and relays run but i've narrowed it down to them boxes.
We'll see what happens, fingers crossed