BA & RR on alternative air fuels

British Airways and Rolls Royce are working together on alternative fuels for air use (like everyone seems to be these days) and interestingly RR are rather down on non-sustainable biofuels. They want a fuel made from biomass that doesn't compete with food production and say that current biofuels don't cut it yetas they only work down to -5C. Testing of up to 4 alternative fuels will be carried out on a ground rigged RB211.