I would recommend reflex glass as a proper solar control performance glass for conservatory roofing.

Whats interesting with reflex is that they offer a clear solar control option to help reduce the heat build up from sunny south facing jobs. So blue tint in the roof and clear in the side frames gives one hell of a solar control installation.
We used it recently on a job and it felt instantly cooler when you walked under the glass.

www.reflexglass.co.uk