In fact, the old clutch looked perfectly fine, I've no idea how many miles were on it, but it seemed good for another ~50K+. Anyway, I'd pre-emptively purchased a clutch on eBay some time back, and it was straightforward to fit.
Clutch alignment is the basic requirement, since I didnt have a spare input (primary) shaft, I had to make something out of a steel rod and duct tape:
Simple, but effective:
So, with the tool in the pilot bearing, the cover bolts on pretty easily: