Woman who sang that in the "Boat" at "Straw Bear" this year is called "Jo" lives in the Romford area of Essex. Believed to be an active singer in that area. Don't know if that will help you? The complete line is "A penny for the ploughboys, only once a year" You could also try contacting "Old Glory Molly Gang" they have a website. a) They use the line as a legend on some of their publications. b) I think "Jo" is known to one or two of them. If I come across her in my travels, or get any other info will attempt to put you in touch.