The court heard Giff met Ms Ramsden on other occasions, including one December 2011 shift when he was on duty outside Downing Street but on a legitimate break from his 12-hour shift.

BBC: Diplomatic protection officer jailed for sex on duty

Hayley Amos, a senior neonatal staff nurse at Stafford at the time, told the hearing she reported for duty on the 7am shift, after the drug was administered.

BBC: Stafford Hospital nurse accused over twins morphine error

At 03:00 BST on 8 April, Donovan passed a sobriety test, which involved an officer smelling his breath, when he woke up for his guard duty, despite having been drinking before his shift.

BBC: Able Seaman Ryan Samuel Donovan