I was junkshopping yesterday afternoon Chris, and I came across a few of these Mike Morton Plexium LPs in the same box. I found this one, and also the LP with its B-side, "The Banner Man" on it. Putting two and two together, and hoping I'd done the maths right, I bought Volume 3 (the one you see here in the pic), got it home and played it against the Blue Sharks version, and lo and behold - the very same version!
A bit of digging also helped me to find the 2008 thread from here, where this version was mentioned, but I don't think any concrete evidence had been provided at the time.