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I don't think there's anything peculiarly British about that usage. It's easy to find examples of Americans doing the same thing, e.g.:

>The report, in an op-ed from commentator David Ignatius, cites a senior US official as saying that “the framework is agreed” and the parties are now “negotiating details of how it will be implemented.”

https://www.timesofisrael.com/liveblog_entry/washington-post...

How do you feel about the word "okay"? The word can mean anything. Must drive you nuts.

I think it's short for "agreed upon"

Well they're English, they invented the language. I don't know why they're trampling on it.

Languages evolve, capiche?

headlines often trade legibility for terseness, sometimes a bit too much though :)

EDIT: Headlinese: https://en.wikipedia.org/wiki/Headline#Headlinese