Yeah, so the last years when I toured London, I made sure to wear a diaper. We all know how difficult it is to find public toilets in foreign cities (and countries), so I figured I'd save myself the time and hassle of looking for a public toilet (and paying money for it, as it's often the case in my own country), and just wear a diaper.
But as a dumb tourist, I was too stupid to find the proper information to tell me where to find toilets in London. What brings on this sudden realization, you may ask? Oh, I was browsing the website of Transport for London today (the company that manages all of London's Underground services, buses, trams and some trains), and found a "Toilet Facilities Map on the Tube". I'm not kidding: Go to their official website and scroll down: Maps | Transport for London
So this map tells you everything you need to know about toilet facilities on each and every London Underground station:
For example, there are toilet facilities at every single station on the Metropolitan Line (the purple-brownish line going off towards the top left). Even Warwick Ave station - the station Duffy was singing about in her famous song of the same name (one of the most popular songs of 2008) - has toilets, although those aren't mentioned in the song
And the map even tells you where the toilets are:
as some of them are located inside the fare-paid area (i.e. you need a ticket to get through the barriers to use the toilet), while others are located outside.
So, no need to wear diapers any more for tourists in London - just keep the Toilet Map in your pocket. I'm sure every Londoner has one!