Thanks for the advice Richard.
I have found a us website
www.astronomics.com that quotes the measured eye relief for the eyepieces they sell, and the astro-tech is in there with 20mm of eye relief.
I will search foe reviews of the astro-tech and zhumell to see how they do.
Astronomics also show ultima lx and x-cel lx with 16mm eye relief and the Meade hd-60 with 17mm of eye relief. How do these compare with the astro-tech?