Deposit. It's the ex-banker in me that thinks that way.

In terms of actually shocking HRH, I suspect it is quite hard to do; she was in the army, had Margaret for a sister, and has Phil the Greek long term. Have a look at those old clips of her finishing orff pheasants that the guns haven't quite despatched, I reckon she isn't squeamish.

Despite the miracles of modern science I don't think we've yet found a way for somebody else to micturate for us, which is what I at first thought you were suggesting.

BTW: forgive my curiosity, but how do you operate those devices?