Does anyone have any good recommendations for outdoor arena mirrors please? Also horror stories welcome, but please send those via email!

Many thanks

Have a look on ebay, they do stable mirrors aswell.
Mine has a hissy fit when he see's himself, even windows if he hasn't seen the frame of it miles away.
Might be worth putting ordinary glass if you have bits spare on different angles, if he/she is fine get the mirrors, start at a distance, then bring them closer.
Hope that helps :-)

Thanks very much Jayne, all sorted & they are going up shortly.