Thank you JohnBoy!
Well yesterday I manoeuvred (read: drove) Honey around the driveway. Had to keep the revs up to stop her cooking out, and the clutch is extremely high, more like an on/off switch. She moved just fine though, first gear and reverse.
Seeing as it was a bank holiday we thought we would have a few beers and take the engine out. We got so close and then stopped for food, but you know how it is once you stop... So we packed in for the night. Got back at it this evening after work though. Unbolted that metal plate, and with a fresh set of eyes also noticed we'd forgotten to unbolt the starter motor - rookie error, but this was only our second engine removal.
Gave the bay a little clean up and here's how she looks now.
Anybody got any ideas what causes the interesting pattern on the windscreen? Something to do with sunlight I'm assuming?