Charlie Pridham wrote:
Its not glass, its a double skin of some sort of high tech plastic with air
between (they are really quite thick when seen close to, 1' or more) and is
extremely energy efficient, the individual panels behave rather like
magnifying glasses.

Yup. Those panels let more day light in than glass. The entrance of
Piccadilly train station in Manchester is built with the same stuff.
They also have a lower environmental impact than glass. We went to Eden
2 years ago in August and all my youngest can remember is the 'glassed
jungle where James Bond slided on'... I enjoyed it very much,
especially the californian meadows.