Re - the call to arms. It's so famous, I'm surprised if it isn't on display, but I did read a comment from someone who visited a couple of years ago saying it used to be on display but wasn't there last time they went. I hope it hasn't been stolen, because I've always wanted to see it! (is it in the catalogue? If not, it may be kept in their archives as some ink reacts with paper and actually can eat through it!)

My favourite thing in the London science museum - John Dee's 'scrying glass' (he was an Elizabethan necromancer and model for Prospero) - was stolen recently. I think I'm probably the only person who cared!