Here's the sump removed and given a quick clean.
The new sump drain valve is quickly fitted in place, and although, once tightened, is at a bit of a jaunty angle, it is at least, the right way up.
I noticed some light scratches on the underside of the sump, which acted as a reminder to fit a sump guard!
The billet sump was quite costly (even though it did not come in that Waitrose box!) and needless to say I would like it to stay in one piece.