Ball park conservatory cost?

[momb]

Our conservatory (Quality brand from the East of England) is over 10 years old and out of warranty. It has dropped 3" at floor level and needs to come down/be replaced.
I fancy having a proper extension instead but need an idea of what the insurance will pay out.
The on-line price checkers want my details and I have to agree to be called which I really don't want.
Could anyone here give me a ball park price for a 12' square Victorian style eco glass double glazed dwarf wall with electric and fan but no heating?
thanks in advance