The almost £10million-a-year security bill for protecting Britain's eight living former prime ministers is 'unsustainable', the Home Office has been warned. The UK currently has its largest number of former heads of government in history, fuelled by the Conservatives' tumultuous period which has seen the party go through four PMs in three years. As many as 120 specialist police protection officers are needed to give the ex-British leaders round-the-clock security, ex-officers have claimed. The eight living former PMs are  Sir John Major, Sir Tony Blair, Gordon Brown, Lord Cameron, Baroness May, Boris Johnson, Liz Truss and most recently Rishi Sunak. Their security is funded by the Home Office but officers are provided by the Met Police and some local forces, armed with guns and tasers, despite all English and Welsh forces battling with a shortage of firearms-trained officers....read