A West Yorkshire environmental specialist has completed its biggest shipments of “green” oil to be used as a hi-tech aviation fuel across the world. In its first four full ocean tankers, the Halifax-based Leo Group shipped 10,700 tonnes of tallow, accounting for 10,700,000 litres of oil, recycled at its Omega Proteins plants in Bradford and Penrith. The tallow, a natural by-product rendered from animal waste collected by the company from all over the UK, is a key component in the process to create an advanced form of biodiesel.