Writing in the  Telegraph Lord Hague says Mrs May should be “bold” and introduce a “major change” in policy, warning it is “deluded” to think cannabis can be “driven off the streets”.

His intervention comes as the Prime Minister faces a growing Cabinet row over whether to allow medicinal use of the drug following pleas from the mother of 12 year-old Billy Caldwell.

Two of her most senior ministers – Sajid Javid and Jeremy Hunt – are understood to be pushing for a review of cannabis use but the Prime Minister is said to have…