Sir Harcourt Courtley – Simon Russell Beale
Charles, his son – Paul Ready
Squire Harkaway – Mark Addey
Grace Harkaway, his niece – Michelle Terry
Mark Meddle, attorney – Tony Jayawardena
Cool: Nick Sampson
Lady Gay Spanker – Fiona Shaw
Mr. Adolphus Spanker, her husband – Richard Briers
Mr. Solomon Isaacs, Junix Inocian
Charles and Dazzle arrive back at Sir Harcourt's London home after a night on the town, and manage to avoid Sir Harcourt with Cool's help—Sir Harcourt still believes Charles is a clean-living innocent. Max arrives to make the final arrangements for Sir Harcourt's marriage to Max's niece Grace—by arrangement, Sir Harcourt has financially helped Max in return for making Grace's inheritance contingent on her marrying Sir Harcourt (if she does not, it will pass to Charles). Sir Harcourt leaves and Dazzle bumps into Max, gaining himself an invitation to Oak Hall, Max's country house—a trip on which Charles will accompany him.At Oak Hall, Grace explains to her maid Pert her acceptance of marriage to the aged Sir Harcourt and her view of love as an "epidemic madness". Charles and Dazzle arrive, and the former (not knowing of his father's marriage plans) immediately starts courting Grace. When his father arrives, Charles pretends he is actually a man called Augustus Hamilton who merely bears a remarkable likeness to Charles.
Max's daughter Lady Gay Spanker and her husband Adolphus (“Dolly”) arrive, and Sir Harcourt immediately falls in love with the former. Grace begins to fall in love with Charles/Augustus in spite of herself and so, when Lady Gay interrupts their courtship, Charles easily persuades her to distract Sir Harcourt from marriage to Grace by apparently accepting his affections.
Charles leaves as 'Augustus', returning as Charles to tell Grace that 'Augustus' has been killed, to see if she really loves him, whilst Lady Gay and Sir Harcourt plan to “elope” together. However, Dolly and the meddling local lawyer Meddle manage to prevent the elopement.
Dolly challenges Sir Harcourt to a duel, but both of them escape alive, and all is revealed. Dolly forgives Gay and Sir Harcourt finds out his son's true nature as well as acceding to the marriage.
What the critics said:
There were no YouTube clips really relevant to London Assurance, so instead I treat you to some pictures of the wonderful set and the costumes: