At the end of last year Mr Kiley submitted his alternative to the government's favoured public/private partnership for the modernisation of the tube, which calls for£10bn in investment over 15 years.
Mr Kiley said: 'This plan can be accomplished without exposing the public to fare increases and without any form of financial guarantees from the government. Transport for London fully expects that at least 90% of the investment programme will be carried out by the private sector under this plan.'
Ministers have met Mr Kiley twice to discuss his plans but are still keen to push ahead with the PPP. Bids have already been received from
the private sector.