asked the Secretary of State for Transport what proportion of the cost of commuter rail services to central London is covered by passenger fares; and what proportion is defrayed by subsidy.

The information is not available. The costs of British Rail commuter services are not identified separately in the British Railways board's accounts. Under section 3 of the Railways Act 1974, grant is paid to the British Railways board in respect of passenger services generally, and is not attributed to specific areas of operation.