You should use modern furniture in this setting. Leave the antiques in the house where they belong. Rattan garden sets are all the rage currently, and they come in many designs from which you can choose. They will not suffer damage from the ultraviolet light, and you can take them outside if your wish.
- Roller blinds are cheap and cheerful. They come in all colours under the rainbow too, so there is something for every scheme.
- Venetian blinds are a viable option in conservatories. Along with their vertical cousins, the slats bring a commercial that is ideal for contemporary settings.
- Roman blinds are not my first choice, but they could suit a conservatory on a country cottage or a hippie lifestyle.