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My understanding too.
I've driven so many times where some dick is sitting in the middle or 3rd lane with nothing on the inner 2 but they continue to sit there.
At the risk of sounding daily mail younger drivers may not have had this drilled into them like older people and there seems to be a new breed of entitled people who do what they want and don't care what effect it has on others...although maybe this is just human (generally male) behaviour:
Middle lane hogging, manspreading, being loud, etc etc
bloody people
I am victor meldrew, middle aged, sometimes grumpy and guilty of hooting at people i think are crap drivers too often
Sitting in the middle lane for no apparent reason seems to be a very British thing. You don't see it in other European countries anywhere near as frequently. Maybe it's because drivers on the mainland absolutely love a brutal tailgate.