The leafy substance khat, grown by many Kenyan farmers, is of economic and cultural significance to many Africans. The UK government has decided, against the advice of its own experts, to treat khat as a class C drug to "protect vulnerable members of our communities". In July, UK Home Secretary Theresa May said khat would be banned "at the earliest possible opportunity" but a ban has yet to be imposed. A team of Kenyan MPs lobby the UK government not to follow suit.