Laura Round, from the liberal conservative think tank Bright Blue, explained: “One of the main reasons the Conservatives lost their parliamentary majority in 2017 was their failure to appeal to younger and socially liberal voters, especially in metropolitan areas.

“Bright Blue research shows that the Conservative Party could woo these younger voters by championing environmental policies.

“For instance, our polling found that 77% of under 40s would be proud to vote for a party that banned the sale of all ivory products in the UK – a pledge that was missing from the party’s recent manifesto.”