Not yet - I was a bit pushed for time. Initial indications are that it will be a fuse in the box under the bonnet rather than in the cabin. I'm basing this on the fact that one of the red cables off the battery showed only very low (expected current). The other which I think is the fancy one that runs under the car, to the JB on the bulkhead (I think). I'm registering a good few amps on conduits coming in to and out of the smaller fuse box under the bonnet so (again I think) the fuse protecting whatever is at fault is in that smaller black fuse box.
I'm struggling about to find a wiring diagram that covers the electrical stuff on the engine. I've got the WDS disc here but the only laptop with a DVD slot has an old version of Java and I can't get it on my wifi to update !