Friday evening update!
About 3 this afternoon, I started (with help from Ozzy jr) to remove all the underside gubbins necessary to free the loom from the gearbox. Exhaust, heatshields, propshaft, two braces and the gearbox crossmember later I can get a hand over the box and the loom freed from its clips.
Back in the engine bay, off comes the aux belt and tensioner so I can get at the clips holding the front section in place. Sometime around 5 ish I chopped the old loom in half so I didn't have to remove the waterways and hauled it out. Its even more knackered than the other one was.
Fast forward to about 7, car is back together and ready to start.... it doesn't. Plugged the coilpack in
and it tries, but backfires and won't stay running. I've got the coil order wrong. The other engine is already in bits, and BOA engines have a different coil order. COCK. We packed up, and went and got pizza and beer.
I know what the order is now, I looked it up on autodata. Tomorrow is startup day!