Mr Red, the disc to which are referring was probably one of many that were around in the late 50's early sixties. My own first taste of Woody Guthrie was on an aluminuim based acetate disc labelled in handwriting Sonny Terry's Washboard Band. It was of course a bootleg copy of a Folkways recording with Woody, Cisco, Sonny and possibly Brownie McGhee. I still have the disc in question.
At the time it was illegal to import and sell recordings from the States and so these copies were made. There was a time when the folk/jazz record shops in the west end of London, Charing Cross Road in particular were raided by customs and excise for stocking some US illegal imports and the material confiscated.
I doubt very much if Woody did record on that brief trip between shipping in and out. However I am continually pleasantly surprised to learn of "new" old recording finds that turn up, particularly in the Blues field.