I have one of these, that works on the one ahead principal, but can't for the life of me remember whether it is a Tenyo release. No fancy casings, justs three sliding compartments with orange covers. Anyone shed some light on this one, please?

If the orange covers each have an ESP symbol, then it's likely Tenyo's second release of the trick called "Occult Board."
The trick itself is Hen Fetsch's "Mental Epic."

Thank you Richard, that's the one. Found it years ago feeling very sorry for itself in a small back street magic store and I wasn't even thinking Tenyo at the time - think the price appealed more than anything.