That's because British people only have two uses for water: hot water for their tea, or cold water for splashing on their face after getting tipsy at the pub. #stereotypes
~Not-"Not-So-Handy Andy" Jack
Can someone in there turn the water on? No, I don't know the secret knock...
But still worse than pretty much any other option. ~Not-So-Handy Andy
The note says "Hot Doesn't Work," in case you were curious.