Radio 4 is also the station that if there is no communication with mainland UK, and Radio 4 no longer broadcasting, submarine commanders were to assume the coun

Radio 4 is also the station that if there is no communication with mainland UK, and Radio 4 no longer broadcasting, submarine commanders were to assume the country was attacked and destroyed. https://en.m.wikipedia.org/wiki/Letters_of_last_resort https://en.m.wikipedia.org/wiki/Letters_of_last_resort