France and the UK have agreed to extend their "one-in, one-out" migrant returns agreement until 1 October, a French minister said on Wednesday. ADVERTISEMENT ADVERTISEMENT The scheme, known as Operation Hillmore, came into force in September last year as part of efforts by London and Paris to tackle illegal migration across the English Channel. Under the arrangement, Britain can return some migrants to France who arrive illegally by small boats and are deemed not to have a right to remain in