Hi, there dawa - welcome to the board.

Sorry to be of no immediate help, because I've never had occasion to call them anything (thank goodness! they look uncomfortable and dangerous - I could just about accept them as a means of emergency embarkation but for getting off the ship? no thanks!!)

Suggest you look for the Imperial War Museum's web-site - no idea of the address, but should be fairly easy to turn up. They are bound to know, and I will be surprised if they don't have an enquiry service.

Good luck - don't get your feet wet!