The Downing Street Policeman is a minor character in the 2017 film Transformers: The Last Knight. The role is portrayed by actor Rob Jarvis, and the character appears in a scene set at the official residence of the British Prime Minister.

As suggested by the character's name and occupation, this individual is a uniformed police officer assigned to guard the entrance of 10 Downing Street in London. In the film's narrative, the character is present when Sir Edmund Burton, a key human ally to the Autobots, arrives at the Prime Minister's residence. Burton seeks an urgent audience with the Prime Minister to convince the British government to rally a defense at Stonehenge against an impending global threat.

The scene featuring the Downing Street Policeman underscores the heightened security and access restrictions surrounding the seat of the British government. His presence creates an initial obstacle for Sir Edmund Burton, who must gain entry to speak with the nation's leader during a time of crisis. The interaction highlights the urgency of the film's plot and the need for key human characters to navigate official channels and security protocols.

Given the character's extremely limited screen time and lack of dialogue or a named identity beyond his function, no further information regarding his personal background, distinct personality traits, internal motivations, significant relationships with other characters, narrative development across the film, or any unique or notable abilities can be provided. The character serves a purely situational and functional role within that single scene.