British government records are not simply public domain

Are British government documents freely reusable like U.S. federal government documents?

No. Archive consultation can be free, but access and reuse depend on the route and intended use rather than an automatic public-domain rule.

The United Kingdom does not follow the American federal public-domain model. A researcher can obtain a reader's pass and consult records at The National Archives without charge. Remote access, copying, and other routes to the material can carry fees. Reuse also depends on the intended purpose and applicable conditions, so free consultation should not be mistaken for an automatic right to reproduce every government document.