Home secretary Priti Patel and Rwandan minister for foreign affairs and international co-operation, Vincent Biruta, signing the immigration agreement last month.

Flights taking illegal immigrants from the UK to Rwanda will not happen for “months”, despite Boris Johnson insisting he wanted them to begin in weeks.

In a major blow for the controversial policy, the prime minister’s official spokesman said legal challenges were one of the reasons behind the delay.

Johnson announced last month that........

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