It came in the post this morning. I'm going to give it a clean later this morning with a 1:4 white vinegar/hot water solution with some washing-up liquid, and I'll see if I can get photos uploaded then (no promises, though). I've got some barbicide on order from Amazon, so, once I've sanitised it, I'll try it out.
I did pop a blade in it from my used blank bank to see if it would accept them. It did, but the pins are smaller than the holes in the blade, allowing the blade to twist as the handle is screwed-on. In addition, the tabs at the ends of the blade stick out a long way, and, as well as the single, wrapped Blue blade in the blade case, there's a (very rusty) thicker blade without the tabs, which I think must be the original style of DE blade. All these factors taken together suggests to me that it's an old-type clone. Only mark on the case is the word "FOREIGN" stamped into the metal on the underside.