That's quite a long time ago, and was in the shadow of a very real nuclear arms race between superpowers able to destroy this country easily. Having a big friend made sense, and Europe was still recovering from a horribly destructive war.
Since then we've been involved in 'wars' without general British public support and that have not only made England unpopular in the world, but have shown our previous military ability to be on the wane.
I would expect a new government of any party to be incredibly wary of this, and to be actively moving our involvement in international affairs away from what is now a general distrust of American foreign policy.
Empires fade quickly.