To all those who have offered advice,
Thanks for your comments and recommendations; clearly getting the right eyepiece set and accessories is a marriage between experience and gut instinct. One thing I have definitely picked up, is that optical correction devices are no substitute for quality of the primary components. ***note to memory - stop picking expensive hobbies!***
I certainly haven’t wasted my money on my current eyepieces; I’m buying a Dob for my father in law - who’s wanted a telescope since his concentration camp days when he was 6yo

– and since his eyesight is moderate, I might just progressively give him what I’ve got. It looks like the current economic climate is forcing the top-end prices down, so it might be a good time to start.
I think I’ll get a couple of Tele Vue Naglers and look at Pentax next buy.
Thanks once again!
Cheers
Mark