Jolitorax from Britain comes to the Gauls to ask for a barrel of their magic potion so the British soldiers can be strong and drive the Romans away. Jolitorax here is a bit like a secret agent, if we look at the title: 'In Her Majesty's (Secret) Service'. Astérix and Obélix escort him to return to Britania safely, and they drag along Goudurix, who actually wants to be a bard, but in the eyes of the Gauls, a man should be able to fight - and chase wild boars.
What follows is more or less like in the books, with some new characters, notably Ophélia, Jolitorax's fiancée, and her governess.
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