The Department for Transport has not undertaken research specifically looking at Britain's capacity to export biofuel overseas.
The Renewable Fuels Agency's (RFA) annual reports include a section on the effects of the Renewable Transport Fuel Obligation (RTFO) in the UK, including impacts of the RTFO on UK business. The RFA annual reports can be found at:
In addition, as part of their Renewable Energy Statistics work, Department for Energy and Climate Change completed research in July 2010 on the UK Production of Biofuels for Transport in 2009. This covered UK production capacity and biofuels end markets.