my favorite subject! The Rkyo cassettes - not worth much at all. Most record fairs have them for pennies, sadly much like the CDs. It only seems to be the Ryko double vinyls that have kept or improved their valve. But it's the cassettes (the EMI versions at least) which hold the best memories for me :o)
I have Heathen on cassette... I would be amazed if Reality was issued on that format.