From IMDB:

A contemporary thriller featuring the Royalty and Specialist Protection Branch of London’s Metropolitan Police Service.

From Netflix:

Sgt. David Budd is promoted to a protection detail for UK Home Secretary Julia Montague, but he quickly clashes with the hawkish politician.

From Netflix you can stream the 6 episodes of the only season available.  Each episode is an hour except the last episode which lasts 75 minutes.

In Britain this TV series was a well-deserved smash hit. Character interplay, plot, action sequences, and romance are seamlessly joined. Because certain scenes are meticulously detailed (for example the disarming of a bomb attached to a person), some viewers might at times find the film progress slow. However, for me those details just added to the unceasing tension.  At times I was literally on the edge of my seat.

Purposeful spoiler: the series has a satisfactory end.

WARNING:  British thriller TV series are not squeamish and have no qualms about killing off characters that you might think were essential to the plot.

Gina McKee (who plays Anne Sampson) was familiar to me as the actor who played Irene Forsyte in the 2002 TV series “The Forsyte Saga”.  Along with her character, Richard Madden (as David Budd) and Keeley Hawes (as Julia Montague) steal the show. But all the acting is wonderful.

As far as political thrillers go,  you cannot go wrong with this series.