When I  first became aware of public telephone boxes – that would have been in the early 1960s – they operated as follows. The caller first inserted a suitable number of coins, and then dialled. If the call was answered, the caller had to press a button marked ‘A’ in order to continue the call. By pressing this button, the inserted coins moved into the cash box. If, on the other hand, the recipient of the call did not answer or was busy on another call, the caller had to press button ‘B’. By doing so, the inserted coins were returned.

The A and B call boxes were later replaced by another system. The caller dialled the number. If it was answered, the caller heard a series of beeps. At this point, the caller had to insert money in order to remain connected. Many years after this newer system was installed, my father used to yell down the ‘phone:

“Press button ‘A'”

He did this despite the fact that button ‘A’ no longer existed.

Today, with the advent of mobile telephones, mastering the intricacies of operating public telephone boxes has become almost unneccessary.