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.

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