If that's the same version that he recorded with Pentangle on Cruel Sister, then it's a bit long -26 verses- to type in at present, but I'll do it in a day or three if some brave soul doesn't get there first.  Jack Orion is the title given to the song by A.L. Lloyd, who partly re-wrote the old ballad Glasgerion and put a new tune to it.  Pentangle's recording uses Lloyd's tune (he isn't precise as to whether he wrote it or co-opted it from somewhere else) but they seem to have been unaware of his involvement.  Their text seems to have been worked up from versions of Glasgerion.  Meanwhile, there is a version -without a tune- on the DT, here, called Glenkindie, as recorded by McColl and Seeger.

Malcolm