The UK has "not fixed the numbers yet" on how many migrants will be returned to France as part of a new "one in, one out" deal, the home secretary has said.
Former prime minister Liz Truss, historian Dr David Starkey and Sir John Redwood are among 34 signatories to a letter alleging the British Museum is part of a "covert" and "accelerating campaign" to return the Elgin Marbles to Greece.