Iain Dale is Leading Britain's Conversation.
26 July 2017, 16:27
This lady often hears knocking around her house in a very specific knocking rhythm. James thought it might be a secret code from next door, but the answer is slightly more interesting!
Where does the knocking rhythm 'knock knock, kn-knock knock, knock knock' come from?
It comes from the tune of 'shave and a haircut, two bits' which was what people sang when they went door to door, offering haircuts.
Christian in Norwich
Qualification - heard this on the radio a few months ago.