@Alex Hi Alex, I use the Mirona high refelctive grey 6mm. From my site it’s the best mirror for this. I also had a Mirona High refelctive (without grey) but there i had some problems: you see the Display case/frame though the mirror and the reflection was very bad (non existent)… Marcel

@Davepre did you find a good place in London in the end? I’m trying to build some MMs for Christmas and need to get some glass!