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As part of the investigation, officers are carrying out searches at a number of addresses in the Greater Manchester, London and Swindon areas.

The investigation is being led by the Met's counter-terrorism command, supported by officers from Greater Manchester Police and Wiltshire Police, as well as counter-terrorism officers from across the country.

One of the most common reasons cited was a desire for greater economic stability and child care.

The party also has two new mayors in Greater Lincolnshire and Hull & East Yorkshire.

In her victory speech, Reform's new mayor for Greater Lincolnshire Dame Andrea Jenkyns said: "I say 'no' to putting people in hotels. Tents are good enough for France; they should be good enough for you in Britain."