Thanks Lewis, Richard, Colin and Rob
With the primary mirror focal length just 63.7" or 1618mm the eyepiece height at Zenith is just 1565mm which means it is seated viewing from the horizon to zenith


that suits my weary body just fine.
The focuser has been rotated 12º so that when viewing lower objects one is still comfortable
The SIPS Paracorr means the effective focal length is 1860mm making the effective F ratio 4.06.
My plan is for a simple set of eyepieces with the Nagler 22mmT4, Delos 14, 10 & 6 making up a set that will cover from 85x with TF0V of just under 1º to 310x at 0.23º. I also have the APM 30mmUFF for a wider 1.18º albeit with a slight loss of light due to excessive exit pupil....