Well.....my 12" mirror has been expertly recoated by Isaac from Chi Qin...WOW what a difference at the eyepiece!!
This has now allowed me to fully utilise the capabilities of the Catseye system.
Whilst it has been a steep learning curve, I now have the understanding to precisely collimate my scope.
Again a big thank you to Jason D for his help.
If you want a truly accurate method of aligning your optical system, especially in the the critical area from F5 and below, then this is the system for you.
Cheers, John.