Keir Starmer and Emmanuel Macron will announce a “one in, one out” migration deal on Thursday that will involve the UK accepting some cross-Channel asylum seekers but returning others to France. The two leaders are expected to cap the French president’s three-day state visit to the UK with a press conference in London at which they will announce the new plan to tackle small boat crossings. Officials were still in talks over the details of the plan on Thursday morning, including when it would begin, but other hurdles such as the opposition of other European countries are understood to have...