The UK should remain the customs union, the former Conservative chancellor Ken Clarke has told BBC Hardtalk’s Sarah Montague.

“What on earth we have decided to leave the single market and the customs union for I cannot imagine because the public did not vote for that, no-one ever mentioned it to them,” he said.

Watch the full interview on Friday 26 January 2018 on BBC World News, the BBC News Channel or watch again on BBC iPlayer (UK only)