Mr Farage will be joined by MP Sarah Pochin and Westminster councillor Laila Cunningham when he is expected to propose a major prison-building programme aiming to provide an extra 30,000 places to alleviate the overcrowding that prompted the Government to expand early release schemes.

Nigel Farage announced plans to deport foreign prisoners as part of a crackdown on crime at a press conference today. The Reform UK leader said his insurgent party would aim halve crime in five years if they win the next general election.