Ossification: – a tendency toward or state of being molded into a rigid, conventional, sterile, or unimaginative condition

The crisis of the West isn’t immigration. It’s immobility.

And that is the real story.

Politicians talk endlessly about who’s coming in. No one talks about who can’t leave.

– Adrian Monck – 7 Thin.gs Newsletter

Reading: There is a crisis of immobility in the United Kingdom

The reference made in the cartoon is well ossified itself
https://en.wikipedia.org/wiki/Class_sketch

You can watch the whole original joke from The Frost report of 1966 here

https://metro.co.uk/video/ronnie-corbett-s-classic-class-sketch-1278885/?ito=vjs-link