'Take back control' is an easy slogan to create but fiendishly hard to implement - and Sunak knows it | Beth Rigby

Back in 2016, in the run-up to the EU referendum and as Leave campaigners promised to "take back control" of our borders, chief Brexit cheerleader Nigel Farage promised the British people that leaving the European Union would allow the UK to cut net migration to below 50,000.