I don't think there is an imperial mentality left in Britain.
You don't think ?
That doesn't change the reality though ... Their parliament composition is an example.. of what they stand for .
They still sing long live the queen who wears crown jewel stolen from Hindu temples.
They still interfere in democratic setup of other countries. They still have illegal control over islands around the world that include Diego Garcia in Indian Ocean.
And we repeatedly hear their leader's taunting us of our colonial history.
Africa --- something you may never care about since they are black people...
The whole continent is still fighting the colonial powers and their ill concieved plans to exploit them.
Anyway you had defence relationship with pakistan because you felt it was beneficial for you. Point is every country look out for itself, you did that for yourself.. by aligning with Pakistani Defence establishment which is our arch enemy , so now don't expect the others to sacrifice themselves for your interest.