Parliamentary and Diplomatic Protection (PaDP) is a branch of the Protection Command within the Specialist Operations directorate of London's Metropolitan Police Service.
PaDP officers guarding the main gates at Downing Street in London
Two PaDP officers outside the Palace of Westminster in 2016
An armed officer on duty near the entrance to Downing Street
Authorised firearms officer
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An authorised firearms officer (AFO) is a British police officer who is authorised and trained to carry and use firearms. The designation is significant because most police officers in the United Kingdom do not routinely carry firearms. The only forces where officers are routinely armed are the Police Service of Northern Ireland, the Ministry of Defence Police, the Civil Nuclear Constabulary, Belfast Harbour Police and the Belfast International Airport Constabulary.
A Ministry of Defence Police officer on duty in London with an MP7 Personal Defence Weapon.
North Wales Police authorised firearms officers with Heckler & Koch G36C rifle during UK general election in June 2017