Did Chris Leslie not say anything about the tune, or where he got it? He has certainly recorded Old Marlborough on Dancing Days; is that what you meant? It always helps to quote the correct title of a tune or recording when asking about it.
Further information on both Marlborough and Old Marlborough can be found at Andrew Kuntz's The Fiddler's Companion. Although some of the sources from which details are taken are questionable, the site is an invaluable resource and should always be the first resort when enquiring about dance tunes. The pages are rather large at present, so I quote the entry for Old Marlborough here:
OLD MARLBOROUGH. AKA ? "Heel and Toe." English, Morris Dance Tune (6/8 time). D Major. Standard. AABB. The tune goes with a heel and toe dance collected in the village of Fieldtown (Leafield), Oxfordshire, England. The first part of the melody is Yellow Joke [2], a companion of sorts to The Black Joke (although not the Yellow Joak published by Walsh in his third Lancashire collection). Bacon (The Morris Ring), 1974; pg. 160.