The red line indicates the hard shoulder but yes, even after the law change here in UK I have not seen much actual change on the road tbh regarding middle-lane hogging.

People are either ignorant, lazy or don't care as there is very little chance of being caught.

That might be realistic, cf. a female's view of the autobahn:

https://ww3.cad.de/foren/ubb/uploads/NoIdea/perscheid32.jpg

by the late cartoonist Martin Perscheid.

What irritated me a bit instead, where the cars passing on the right side, until I realized that it was made by someone from UK ;-)