The SRA's consultation document sets out six possible service options, along with their benefits and financial and other implications. The basis of all the options is a new Integrated Kent rail franchise, which will integrate the new high-speed CTRL services with the existing network of South Eastern services currently operated by Connex.

SRA Chairman, Richard Bowker, said:

"The Channel Tunnel Rail Link opens up new travel and employment opportunities for people in Kent, London and beyond. This document balances the development of these new opportunities, many of which arise in areas where new housing is expected to be provided, with the need to maintain services for the many thousands of commuters whose route to work is already established.

"In setting out the issues relating to domestic services on the CTRL, we hope that consultees will respond with their considered views about priorities and possibilities for future development. Not everyone's aspirations can be met from day one of the new franchise, and not all aspirations are affordable or represent value for money."

The core service option would comprise four peak hour services between Gravesend and London St Pancras, with a further two trains running from Canterbury West and two from Folkestone Central both via Ashford, where they would join for the onward journey to St Pancras. Off peak, broadly half this level of service would operate. Five further options set out extensions from this core route - to Mid Kent, the Medway towns, and the Thanet towns. The full CTRL domestic service plan is likely to have a phased introduction.

The aim has been to focus on options that complement existing services between Kent and London, optimise the use of existing track capacity, improve journey times and service reliability for passengers, and support key regeneration areas. Significant journey-time savings are expected.

Additional public subsidy of at least £200m over the life of the project would be required to support high-speed domestic services. The economic appraisal shows that the core service option offers, by a significant margin, the best value for money to the taxpayer of the options set out in the document, and it is the SRA's preliminary view that this should be the basis on which services should be planned.