The best I had was from Rachel Berstone who signed my guestbook: "I actually have friends who met on the Tube and are now married! It helps, I think, that he is French and she is Australian, so the rules about not talking to fellow passengers are somewhat relaxed for foreigners.
It all happened on the Piccadilly line - she was going from home to a class at college in Russell Square, and he was travelling from his girlfriend's house to work. She was curious to see him reading (aloud, in French) excerpts from that very romantic play - Cyrano de Bergerac. He went past his stop to follow her, and invited her to go with him for coffee, on the spot. They did, and a few weeks later they met for dinner, and the rest is history.... now they are married, and live abroad with their three kids - which just goes to show, you can meet your future partner on the Tube!"
On Heart FM today, I heard that some guy fell madly in love instantly with a woman he met on the Tube, he got off the train straight away and got her name tattooed on his leg. Unfortunately he's never seen her since! Perhaps he can track her down with Isawyoutoday.com or use LoveLines on snogLondon to find the most likely liine for lurve.
Metro are also looking for romantic Tube stories and hopefully they will publish these tomorrow!