Squerryes Court, Westerham, Kent is used as the grand home of estate owner Henry Beaumont (Robert Hardy) and his family.
Stewart is very pleased to be invited by Foyle to tea at the Crescent and eats more than her share of the food ordered, including the last lemon curd.
Foyle receives a letter from his son Andrew (a voice-over by the uncredited Julian Ovenden), who writes about his pilot training in the Royal Air Force (RAF) and eating haggis (to hint at his location).
One of the plot devices rests on a letter stolen from the Foreign Office; it purports to be from Lord Halifax, well known for his desire for appeasement or negotiated peace.
The boy Joe (Greg Prentice) and his father Eric (Ian Puleston-Davies) are identified by the surname "Pearson" during the episode, but are credited as "Cooper".
Filmed: May–June 2002 Andrew Foyle is assigned duty flying low-altitude missions in a brand-new Supermarine Spitfire, to help calibrate the new British technology of RDF (radar) and finds himself embroiled in the cover-up of a scandal.
During the investigation, it is revealed that Andrew became a nominal member of the British Communist Party in 1938, while attending Oxford, in reaction to the events of the Spanish Civil War.
The scenes where Andrew Foyle flies under a bridge on his first 'mission' were reused from the 1988 TV series Piece of Cake (flown by Ray Hanna in MH434).
Filmed: June–July 2002 The series was broadcast in the United States on PBS on Masterpiece Theatre on 2, 9, 16 and 23 February 2003 as Foyle's War I,[5] and on Netflix as of April 2014.