"Anachronistic chauvinism" could be the UK's other name...and on that as pointed out before, even the dumbest of the UK elite think like that...as voiced by the pervy Prince himself on an arms sale promotion:

“The United Kingdom, Western Europe (and by extension you Americans, too) we’re now back in the thick of playing the Great Game..and this time we intend to win.” (2008)

...The entire UK military class have always been full of shit about its colonial adventuring, derring-do and how the UK can always "punch above its weight".

Defense Secretary Fallons "...Britain would be able to fight a war against Russia within two years..."(2016) was typical.

I reckon it's worse that mere realpolitic: it's delusion.