It wasn't the AA phone boxes but their radio network. From the article: > Whitehall arranged for the prime minister’s car to have a radio link – with which the

It wasn't the AA phone boxes but their radio network. From the article: > Whitehall arranged for the prime minister’s car to have a radio link – with which the AA used to communicate with its mechanics – that would tell the driver that he needed to reach a public phone box, from which Macmillan would call Whitehall. It was suggested that government drivers carried four pennies, as that was the minimum sum needed in a GPO phone box. I once heard a Radio 4 programme about the letters of last resort, where a senior military figure described the responsibility on a PM's shoulders whilst writing them as "Awesome, with a capital F"