Last acting performance by Jane Downs who plays Dixie Goff in this episode. She had been acting since the early 1950s and Died 20th May 2015 (age 80)
Champagne they drink during entire episode is Veuve Clicquot, which marketing communication is about enjoying life.
Isobel's red Jaguar is the XK 120 model (called a "drophead coupe"): this was Jaguar's first postwar sports model, produced between 1948 and 1954.
Honor Blackman Is best known for playing Pussy Galore in Goldfinger (1964), Catherine Gale from The Avengers (1961) from 1962-64 and Laura West in the comedy series The Upper Hand (1990)