Um, no, I wasn't being at all obtuse (unusual!) - my search hit on an iris identification page, there were lots of pretty pictures of flowers and one of them was called Roaring Jelly... and then it was p'ing down & cloudy and I couldn't see the sky show. Was one of them called Derek? (band not iris).
Jo xxx
PS Haven't been away, just haven't felt the need to put fingers to keyboard recently!