06:00BOOKtalkGavin BarwellBBC Parliament Duration: 15 minutes Wed 20th Apr 2016, 06:00 on BBC ParliamentMark D'Arcy talks to Gavin Barwell MP about his new book How to Win a Marginal Seat.ContributorsPresenter:Mark D'ArcyAuthor:Gavin BarwellGenresFactualPoliticsFactualArts, Culture & the MediaArtsFormatsDiscussion & TalkMagazines & ReviewsBrandBOOKtalk Source: BBC Online