Thanks for the info Brian48nav. Sounds very disorientating, having to switch seats from the one you are learning!
My Herc flying started August 68 and I heard no mention of Herc CPS. Learning the LHS was quite sufficient thanks. Switching seats would have led to needless complication, in my view. I imagine that much the same conclusion was reached at the time.
Pity though, and well done those Co's who scored P1 time on those early Herc courses.