A "one in, one out" deal agreed by the UK and French governments on Thursday proposes that for each migrant the UK returns, Britain will accept another who has made a legal claim in France.

Home Secretary Yvette Cooper said people who arrive on small boats will be detained as part of a 'groundbreaking' one-in-one-out returns deal with France - but refused to say how many would be affecte

Britain will grant asylum to one migrant in France who can prove a family connection to the U.K. in exchange for each arriving migrant taken back by France.