He also launched an initiative in which used cooking oil was converted into biodiesel fuel to power the company's vans in Britain.
Times, Sunday Times (2010)
Long used for cooking, cosmetics and soap, it has now become a principal source of biodiesel fuel.
Times, Sunday Times (2009)
The result was 280 litres of part biodiesel fuel, part low-grade heavy oil.
Times, Sunday Times (2010)