The title of this episode is based on a hymn, There Is A Happy Land (or just Happy Land). The lyrics were written by a Scot, Andrew Young (1807-89), in 1838 based on a Hindustani air he heard on the radio. The version of the music used today seems to have been written c.1850 by Leonard P Breedlove.

Date: Autumn 1912 (the season is mentioned at 18'02").

Sarah background: She adopts the name "Mrs Danby" as Thomas tries to sell the fake diamond. During this episode, Sarah finds out she is six weeks pregnant. She miscarries – the third time she has lost her baby since we first met her.

Thomas background: He adopts the name Mr "Fordyce" (or "Fordice") when trying to sell the fake diamond.

Goof: The "Olympic" poster appears again, partially obscured (7'01") – see the Factfile for Birds Of A Feather.

Goof: At 12'02", when Thomas tells the (true) tale of Andrew Carnegie, he says that Carnegie's steel operation was bought by the American government. In fact, it was bought by John Pierpont Morgan and incorporated into the US Steel amalgamation.

Thomas background / Sarah background: They now seem to live somewhere "south of the river" (Thames) but within a day's there-and-back travelling distance of their old stamping ground of Kilburn.

Goof: Thomas seems to write a huge amount in his ledger without dipping his nib a single time (20'50").

Neville Barber (who plays the Reverend Ryder here) had been seen previously as Brigadier General Temple in Women shall not Weep in UpDown's fourth season.

Gertan Klauber (who plays Max the barber here) had been seen previously as Albert Schoenfeld, the Bellamys' baker, in The Beastly Hun in UpDown's fourth season.

Does anybody know what the classical piece being sung at 35'50" is? The novelisation suggests Tosti's Good-Bye (Addio in Italian), but I am not so sure.

At 40'53", Thomas sings a few lines from Any Old Iron? by Charles Collins, EA Sheppard and Fred Terry – an old London music-hall song.