The "one-in, one-out" deal, which starts tomorrow, will see some of those arriving in the UK returned to France.

Britain said it will begin implementing a deal to return some migrants who arrive on small boats to France within days, a key part of its plans to cut illegal migration, after a treaty on the arrangement is ratified on Tuesday.

A deal to return migrants who arrived in the UK illegally in small boats back across the Channel to France is coming into force today. The ‘one in, one out’ agreement was announced during a state visit from French President Emmanuel Macron last month, as a new means of deterring people from taking the hazardous journey over the water.