What more do you need other than my word ? I've nothing to gain by saying I've heard it, seen it, held it. Nor has Ted Massey. Nor has John Pugh.
He's also had it years, but refuses to tape it for anyone because it is a genuine 'one-off', and as soon as he put's it on tape, it will eventually mysteriously appear somewhere else.
Having said that, I've got it on tape from when he DJ'ed at the 100 Club, 'live' so to speak, so there are 'sound files around'. It's just that you haven't got one !