It can be bought in the UK in cans, but I think it is probably much better the way my friend made it. This is not her recipe, but it was a nice overview of how to put it together, I thought I would share. My friend's was also a log shape and looked much like this when it came out. It was a bit like eating cookie dough with raisins in it. The custard is nice with it. We didn't have raspberries, but that looks like that would be good too.
How To Make Spotted Dick from Video Jug.
So, the name is a bit strange. Spotted being from the raisins or currants throughout, dick (no! not the shape, get yer mind out ter the gutter) may be a contraction/corruption of the word pudding (from the last syllable) or possibly a corruption of the word dough or dog, as "spotted dog" is another name for the same dish. Another explanation offered for the latter half of the name is that it comes from the German word for "thick," in reference to the thickened suet mixture. (according to Wikipedia, my favorite free on-line encyclopedia).
There, Aliceson, does that answer your question? I am sure you weren't the only one with the question.