<p>Former Special Branch officer John Warwicker gives the inside story of the six years he spent in charge of security at 10 Downing Street, tracking one of the most turbulent periods in modern British politics. From 1974?79, when the threat of the Cold War and the IRA was ever present, the 'targets' who Warwicker protected daily, both at home and overseas, were Prime Ministers Wilson, Callaghan and Thatcher. More than thirty years on since Warwi...