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.”
>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...