Blair (Clive Wood) and Palfrey (Alec McCowen) discuss their latest assignment and the inability of the "boys in Curzon Street" to find the source of leaks within their department. The "boys in Curzon Street" are in fact, The Security Service, popularly known as MI5, the UK's domestic counter-intelligence and security agency, which had offices in Curzon Street, London, in the 1980s.
As Blair and Palfrey discuss the inability of the "boys in Curzon Street" (MI5) to find the source of leaks, Blair jokingly asks Palfrey, "Still looking for the submarine logbook, are they?" Blair is referring to the logbook of the UK submarine HMS Conqueror, the first nuclear-powered submarine to fire at another ship in anger.
On 2 May 1982, during the Falklands War between the United Kingdom and Argentina, HMS Conqueror torpedoed and sank an Argentine light cruiser, the General Belgrano, killing 323 people. This act caused considerable controversy, heightened by the subsequent discovery that the Conqueror's logbook had disappeared, which led to accusations of a cover-up by the UK government. The logbook was not recovered until 1986, after this episode first aired.
On 2 May 1982, during the Falklands War between the United Kingdom and Argentina, HMS Conqueror torpedoed and sank an Argentine light cruiser, the General Belgrano, killing 323 people. This act caused considerable controversy, heightened by the subsequent discovery that the Conqueror's logbook had disappeared, which led to accusations of a cover-up by the UK government. The logbook was not recovered until 1986, after this episode first aired.