OPEC siege members of OPEC were taken hostage in Vienna, Austria, where the ministers were attending a meeting at the OPEC headquarters at Dr-Karl-Lueger-Ring 10 (renamed Universitätsring in 2012). The hostage attack was orchestrated by a six-person team led by Venezuelan terrorist Carlos the Jackal (which included Gabriele Kröcher-Tiedemann, Hans-Joachim Klein and Anis al-Naqqash). The self-named "Arm of the Arab Revolution" group called for the liberation of Palestine. Carlos planned to take over the conference by force and kidnap all eleven oil ministers in attendance and hold them for ransom, with the exception of Ahmed Zaki Yamani and Iran's Jamshid Amuzegar, who
Rising Damp Spooner, a professional wrestler, played by Derek Newark. Rigsby gets on his bad side when he and Alan 'borrow' his clothes in the episode 'A Night Out'. Spooner made only two appearances but is mentioned in other episodes in Series 1. Other tenants occasionally move into the house but never became permanent residents, often appearing only in a single episode. Peter Bowles and Peter Jeffrey were among the actors portraying these tenants. Frances de la Tour temporarily left the series in 1975, after appearing in four episodes of the second series, because of theatre commitments. She was "replaced" by Gabrielle