To get some information, a person needs to pay some charges which is understandable.
Most requests are free but you might be asked to pay a small amount for photocopies or postage. The organisation will tell you if you have to pay anything.
I understand that is not a meagre amount. However, if I am even ready to pay whatever it cost, why can FOI deny information that would cost more than £450?
An organisation can also refuse your Freedom of Information (FOI) request if getting information will cost more than £450, or £600................
This is understandable. Few things can never be made public as given in the same link as above.
sensitive information is not available to members of the public.