Before you purchase type of double glazed conservatory in the UK, it is best that you learn more about local conservatory cost prices of fully installing the latest energy efficient & secure uPVC conservatories and whether planning permission for your building is going to be involved.
There are quite a number of companies that manufacture conservatories, orangeries or garden rooms and different designs will use different materials will come at a very wide range of overall cost (view this cost guide UK)
UPVC frames are the most durable, since they are strong and resistant to corrosion. However, they can also be the most expensive if you are going for intricate designs and parameters that stretch them to their design limits.
If you are looking for cheaper variations, you should still consider getting those that are made from UPVC as they are strong, and they are less expensive than those that are made from aluminium or hardwood (even engineered wood).
Before you make any purchase, take a look at your budget first. This will help you to decide better