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Tom Hamilton was the Labour Party's Head of Research and then Head of Briefing between 2010 and 2016, and was part of the team that helped to prepare Ed Miliband, Harriet Harman and Jeremy Corbyn for PMQs. He is the co-author, with Ayesha Hazarika, of Punch & Judy Politics: An Insiders' Guide to Prime Minister's Questions, published by Biteback on Thursday 17 May