Okay, managed to get a sump from a friend, but unfortunately he had painted it gloss black hammerite (don't ask, he did his whole engine and underneath the car in the stuff :shock ).
So, first off it was time to laboriously remove all the old paint from the sump and make it nice and smooth.
Unfortunately, these pics have come out so "out-of-focus" I ended up deleting them :cry .
However, once back to original aluminium, you need to apply an "etch" before you can do anything. As I had needed to sand the sump back, I had lost the original grained finish on the sump, so it was out with the etch-primer and 2 costs of that later plus 3 coats of primer, the sump looked like this:
Nice and grey, but unfortunately, completely smooth finish and completely the wrong colour.
So, on with the next section, the paint.
Much better, and a nice grained finish starting to appear.