I do not live in London but i am fairly regular visitor to the capital to visit family and therefore need to use the public transport as driving is a complete nightmare. My auntie used to live in Camden, north London, and getting around from there was very easy due to the tube being on the northern line and from my experience a decent bus service, sorry couldn't tell you exactly which service. Now living in Lee the train runs about every 15 minutes which is pretty impressive i feel and from her house to Leicester Square say is only about a 15 minute journey. I understand there are occasionally problems with line closures and so on but this comes with the territory of a wide ranging service like this. However i feel that i get a little ripped off when i visit, an off peak travel card costs me £5.70 each day and i might only make one or two journeys. However an excellent and reliable service.