An acquaintance of mine posted this on FB recently. Apparently her family has had it for years but no one knows what it is. It's about 3 inches tall and the metal things release apart when you press the top downwards.
I wouldn't have paid much attention except that I'm SURE I saw one on a very recent trip to a national trust place, so it is now bugging me!
Any ideas? I feel sure I should know! The closest idea I have is something for straining veg...