Have discovered the old Alec Guiness "Tinker, Tailem, Soldier, Spy" series is available complete on YouTube and it is, quite simply, magnificent.
Follow
@andrewplord Smiley's people is (or at least it used to be) up on YouTube for free as well. The one loss was the underrated tv version of another LeCarre classic, The Perfect Spy.
@cyrilpedia Binge watching. Smiley's people might be another night.