CAMPAIGNERS are calling for a £135 million cash boost to improve London Underground's infrastructure.
Business campaign London First said that next year the underground will suffer the lowest level of investment in its core system for the past decade.
In an open letter to deputy Prime Minister John Prescott, business leaders said there was a £1.2 billion backlog of construction work.
The letter stated: 'We urge the government to give London Underground a cash injection of at least an extra £135 million.'
An announcement on the future of the tube network is still awaited, after management consultants were appointed by the government to look at the network in July this year.