I remember vividly seeing that one when I was there and thought the double cord hook was interesting!
Being the ship was put out of service in 1967, that would still have been Hoover's heyday, so I'm betting there were pretty much always commercial Hoovers on board. I'm sure Buckingham Palace is or was full of them too. What is it the appliances say there, "By Appointment of Her Majesty the Queen" or something of that nature.