So … After another month of searching, I have discovered/re-discovered an unreleased game by Ocean Software.
Hunchback was released on most of the home computers of the early 1980s, but I can find no adverts or mentions of it in any of the Einstein magazines.
Was it released then withdrawn? Was it un-released? Who knows.
My copy works in Mame/Mess and on the real hardware so the disk image is good!
It plays very well, although I am rubbish at it) and the graphics are superb for the age of the game (40 years old next year!)
Just goes to show the sorts of quality titles Ocean could have released if the Einstein had sold more units!
Watch out for a You Tube video of it on my channel soon!