If you are getting it redone, check that you are getting a Silicon monoxide or Slicon Dioxide overcoat. Don't accept anything less.
thanks for the wise advise, if you have any suggestions on where to or not to go I would appreciate a PM.
Astro Optical sold off all there mirror making machinary long ago and shut their optical shop, so special order must mean contracting out the manufacture of a mirror to outside.
its a shame so much technical knowledge is slowly being lost....
thanks all, Roger