By Guy Taylor Cost is proving the biggest hurdle to rolling out green biofuels seen as critical in the race to decarbonise UK aviation, according to the boss of one of Britain’s most well-known business aviation hubs. Biggin Hill airport’s chief executive David Winstanley said the price of Sustainable Aviation Fuels (SAF) was “still the biggest blocker” to full take-up, despite subsidies from the UK government. Airlines are banking on SAF, which is made from food waste such as cooking oil and plants, to hit looming green targets imposed across Europe without cutting flights. The UK government …