In research that was published barely three weeks after this episode aired, scientists from Texas A&M studying modern Chinese air pollution announced that they had uncovered the chemistry that explained how the The Big Smoke became so acidic beyond normal bounds.
When Winston Churchill leaves the Queen's presence he turns his back on her. It is customary to leave the room by walking backwards.
In legal usage, an 'act of God' is a natural hazard outside human control, such as an earthquake or tsunami, for which no one can be held responsible. It may amount to an exception to liability in contracts. On the other hand, other extraordinary man-made or political events are deemed 'force majeure'.
When Philip says that Townsend can perform some aerial acrobatics, there is a brief glimpse of Waddesson Manor and its grounds (including the aviary), a former residence of the Rothschild family, who bequeathed it to the National Trust.
The aircraft Philip is flying is a Tiger Moth II, RAF serial DE-992, UK civil registration G-AXXV, owned by Fly Tiger Moth Ltd. It's painted in the markings of a World War II RAF trainer.
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