We are having a conservatory built (3.5mx3m)and want to use it all the year round. We have a south facing garden and have been quoted for standard double glazed wall units (brick dwarf wall) with 'solaglass' roof. Given the position and size, which low 'e' glass specification is recommended as we've been given a specification for Saint Gobain Bioclean Cool-Lite ST. We do not want a ceiling fan or blinds or air conditioning. We have specified all units to be openers in the wall and have two roof vent openers as well. We are also removing the current double glazed sliding door that is the access point from the living room to the conservatory (we hope this will help air flow in summer and heat in winter and encourage us to use it more). Can you advise whether or not a plain low 'e' glass roof will suffice in summer while being relatively easy to heat in winter? We'll be having a single electric radiator in the room. Roof height is standard at around 2.6m internal height, not sure what the apex of the roof would be.Loads of questions so apologies but we are unsure what to do!

You are right to worry about the heat from the sun, it can be a killer, the approach you have taken is a good one but, there is always a but, while your proposal maybe sound if you live in London there are many places in the UK where such a set up will be too cold in the winter.
You need to work out the heat loss for your location, I would guess that you have not allowed for the sort of losses you can have on a cold winters, or summers day, for that matter. Taking that door away may lead to a freezing home.
If you are facing true South, or thereabouts, the sun will not get round to shining in the conservatory until elevenish, leaving you will a cold breakfast room. If on the other hand if you have a three aspect room it will get very hot, very quickly and while your proposal will clear the heat on a windy day, on a still day you will boil.

I would check something like:
Celsius Performance Glass
Celsius Glass, K2 Conservatories
You need a solar control glass for the summer plus a Low E type glass for the winter - and fortunately there are now a number of glasses that handle both the HEAT and the COLD

Just one 'small' point - in my experience, almost everyone eventually ends up installing some sort of shade (blinds) in their conservatory

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I agree wiuth Bazzer, there will almost certainly want some kind of shading. the analogy I use is that you can be uncomfortably hot with sun directly on you at the top of a mountain even when the actual temperature is below freezing, when moving about this is fine, it's only when you stop taht the heat becomes uncomfortable.

I would not however advise you to get blinds for the whole structure - the only areas that should need shading are where you will be sitting with the sun directly on you. I often recommend people to live without blinds for the first year and have an umbrella (decorative if possible!) next to the chair so that you can put it into the ceiling when the sun is directly on the chair(s) - after the year you will see that only a couple of panels are usually needed to be shaded.

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Toby Frost Frost Conservatories

I have just posted an identical question so hopefully I should get some good advice. Can you let me know what combination you decided to go with in the end.

I would thoroughly recommend the roof inserts as we had these inserted in our last conservatory and they significantly reduced the heat and the glare in the summer and also helped to retain a little bit of the heat in the winter.

They are also relatively cheap to install by yourself or by a specialist (approx 750 pounds to be installed by a professional for a 5x4 conservatory.