Orion UK mirrors have done very well in the past . Some users here on IIS are happy (Michael Sidonio, John Hothersall come to mind) and the mirrors tested by Wolfgang Rohr were good
(
http://r2.astro-foren.com/index.php/...rwandte-fragen )
- Rohr's translated comment on one was: "They are high quality mirrors and worth their money - even if they do not have a Zygo certificate. And if this mirror is
properly adjusted in the system, well cooled, and also causes the catch mirror no annoyance, if finally the seeing allows all wishes, then this mirror should allow very high-contrast observations."