Someone's pinched me winkles

"The Cockney tribes in Britain were meeting for the games held annually, once a year, along the River Thames ..." I have this recurring nightmare where on accepting a prestigious literary or cultural studies prize up pops a family member to point out that even at the age of five he was a smart boy and could perform a word perfect rendition of Two Little Boys. So it's a bit of a relief to reveal without fear of humiliation Rolf Harris in something of a more scholarly mode, performing a traditional folk ballad highlighting quaint Cockney customs ...