Ken Livingstone, the former Mayor of London, has had a colourful professional life.

Always a social radical, he pushed the boundaries of London politics as leader of the Greater London Council in the early 1980s. By constantly attacking the Thatcher government’s policies he ensured unemployment, race issues and nuclear disarmament remained high on the news agenda.

After a hiatus as a Member of Parliament he returned to the tiller as Mayor of London in 2000 and surprised many by his comparatively moderate stance on many issues.

However, he had lost none of his radicalism and he quickly set about pushing the boundaries once more, but this time in a green direction. Here are five of his world leading initiatives, which politicians of all hues ought to take notice of.

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