Andrew Tune wrote:
Hoping someone can advise (preferably from experience) on the problem of
too much heat in a conservatory.
....snip...

Look at this material ... mite be a solution to your heat gain problem.
== http://www.mirrorsheeting.com/

Same problems in a greenhouse ... :-)
Ambient 'air' will still be 110defF ... you'll need A/C for that .

Ed.