There's nothing worse than being stuck on a slow-moving tube when you're bursting for the loo. In fact, according to this Reddit thread, some passengers have gotten so desperate that they've sacrificed their dignity and relieved themselves in a moving tube carriage. Yes, really.
If you don't want to resort to pissing on the tube, TfL has put together this handy map, which shows all the London Underground stations with toilets. The map also shows which toilets are accessible for wheelchair users and which stations have baby changing facilities. It's worth noting that you might have to pay at some of these toilets (and sadly the days of spending a penny are long gone), but when you gotta go, you gotta go.
Download the map here.
Want more alternative tube maps? Check out these: