To ask the Secretary of State for Transport what proposals he has to encourage the use of natural gas-powered public service vehicles; and if he will make a statement. 
The Government are currently considering the role which natural gas and other fuels may play in public service and other vehicles. To that end, they are continuing to sponsor studies of alternative fuels, including the £1.2 million collaborative field trials. Natural gas-powered buses are included. Results should be available in late 1996.