You will need to fine it down a bit more before you actually “hit the road”.
For example, you can choose to deal with companies that offer a Prices Guide (like here www.compareconservatorycost.co.uk/conservatories-uk) and also look for at least the following things:

manufacturers of double glazed conservatories, or orangeries may very well be tempted to offer better terms than they otherwise would when there are a lot of customers in the market.

You could take a look at this online guide for quotes & prices