The Man From Montevideo

S4 E4: When a London cabbie discovers a briefcase containing £2 million in the back of his taxi, he decides to start a whole new life and disappears without a word to his wife. Ten years later, Dangerous Davies investigates the murder of a chauffeur who has been found dead in a stretch limousine having been stabbed in the neck with a broken champagne bottle - could there be a link between the two cases?