If you'd like your new Edwardian conservatory to have a solid warm insulated roof, providing the same level of comfort a full blown extension would afford, but with a higher ceiling and a more aesthetically pleased external tiled roof, then why not consider having a new solid roof conservatory extension installed instead. You'll get an improved level of energy efficiency compared to a Glass roof, but you'll have to trade this off against the loss of natural daylight, however you will notice how warm and cosy it feels in the Winter.