Why not just do it?
Boris Johnson was already considering scrapping the mandated use of E10 over concerns that it is adding to the global food crisis by displacing land that could be used to grow crops to feed people. The UK sources around a fifth of the crops for its biofuel from Ukraine.
Land for biofuel for the UK alone could be used to feed around 3.5 million people, according to analysis from the think tank Green Alliance. Halving the amount of biofuel used by the UK, US and EU could free up sufficient grain to replace all exports from Ukraine.