Due to the rising cost of space in the city centre, the market is having to move to a venue in Clerkenwell.
If you're in London, see if you can make it on Sunday. It's at the Royal National hotel on Bedford Way, from 10.30am. If you do go, you'll discover two extraordinary cultures, both of which offer much for the soul.
First, the fair's a great way to explore the Postcard Age from before World War One, when the British alone sent close to a billion cards a year. Back then, postcards were more than just the stuff of holidays, carrying every sort of message from birthday greetings to poetry.
We might not be in the year 2900 yet, but I think the market already proves right a prediction made by journalist James Douglas in 1909:
“When archaelogists of the thirtieth century begin to excavate the ruins of London they will fasten upon the Picture Postcard as the best guide to the spirit of the Edwardian Era.
They will collect and collate thousands of these pieces of pasteboard, and they will reconstruct our age from the strange hieroglyphs and pictures that time has spared. For the Picture Postcard is a candid revelation of our pursuits and pastimes, our customs and costumes, our morals and manners."
With hundreds of thousands of postcards in a single room, revelations are everywhere at the market.