UK set to re-join EU's Horizon science scheme

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The Prime Minister is set to announce that Britain will re-join the EU's flagship science research scheme, Horizon. We get reaction from Britain's leading scientists. Also on the programme: A nationwide manhunt is on for a terror suspect who's escaped from MP Wandsworth. We get reaction from a former head of the UK's Counter Terrorism Security Office. And Margaret Betts - one of the last surviving female codebreakers of Bletchley Park - has died. Her son pays tribute to his mother.