Credited on the original recording, Hark the Village Wake (RCA SF 8113, 1970) as "Hutchings, Sanah Music.  The tune is only slightly modified from the traditional calling-on song of the Earsdon Sword Dance team, on which the text is also modelled.  The best contact would be Hutchings or his current agent, rather than Steeleye Span, which he left nearly 30 years ago!  Ashley now has an official website at  http://www.ashleyhutchings.com/,  where you will find contact details.