Who Dares Wins (1983) on Netflix

It's suspected that a peace/anti-nuke organization in UK has some extremists willing to use terrorism. The action will probably be against an embassy in London. The SAS/Special Air Service try to get the organization infiltrated.

A trooper with the British Special Air Service (SAS) infiltrates a radical political group who are planning a terrorist operation against American dignitaries. A glamourized look at the methods and tactics of the famed British anti-terrorist squad.The SAS are a elite army unit which as well as its Anti terrorist role also performs covert and overt training of friendly countries armed forces and operates enemy lines.

—Keith Loh <loh@sfu.ca>

When SAS Captain Peter Skellen is thrown out of the service for gross misconduct due to unnecessary violence and bullying, he is soon recruited by The People's Lobby, a fanatical group aiming to hold several US dignitaries hostage. But Skellen's dismissal is a front to enable him to get close to the terrorist group. Can he get close enough to stop the Lobby from creating an international incident?

—Rhino <rhino@blueyonder.co.uk>