Ken Livingstone has a very long history of fighting to provide cheap public transport for Londoners. In 1981, at the height of Thatcher's reign, he introduced the "Fares Fair" policy, an election manifesto promise whereby London Transport fares were reduced by 32%.
The Tories were so incensed that the Conservative leader of Bromley Council took the GLC to court, claiming that it wasn't fair as the underground didn't reach as far as Bromley. The courts decided that the Fares Fair policy was illegal, even though it was an election commitment and Londoners had voted for it, and the GLC were forced to withdraw it. It seems that the democratic wishes of voters were not paramount in Thatcher's Britain.
Livingstone can be accused of a lot of things but not fighting to keep public transport fairs low isn't one of them, whatever, you Z-11, the Telegraph, and Andrew Gillian, say.
Said it before, and I'll say it again. The political system demands politicians make cast iron promises
You are obviously not paying attention to what Ed Milliband and Ed Balls are saying, or not saying, Molgrips. They have been both been going out of their way to make it very clear they they will not make any promises, especially cast iron promises.