[holding answer 3 July 2008]: No estimate has been made for 2007-08.
Energy statistics from the Department for Business, Enterprise and Regulatory Reform, available at www.berr.gov.uk, indicate that 654 thousand tonnes (775 million litres) of gas oil ('red diesel') was consumed by the rail industry in 2006.
Applying the duty rate for rebated oils to this figure gives an estimate of revenue in 2006 of approximately £50 million.