The 'beltway' is the orbital road around Washington DC. Inside the beltway is where all the political decisions are taken. Politicians are accused of not caring what happens 'outside the beltway'. 'Outside the beltway' is a common political phrase in US journalism and the equivalent here is 'outside the Westminster village'
Indeed. Sorry, I was assuming we all knew that already.
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It's not hip, or young, the phrase has been around for decades, just not this side of the pond.
I was using 'young, hip and aspiringly transatlantic' in a rather loose sense, to mean something like, 'likely to irritate those sad old men who lose no opportunity of boring everyone with their pointless protests against the "cultural cringe" which they claim to see reflected in what they characterize as the casual and unchallenged Americanisation not just of our language but of so many other aspects of our culture (e.g. politics).'