You have to understand the difference between the "news" of the media you read and the News that free press can and does publish. About poking the bear... well the UK did not kill a dissident in Moscow with Polonium. That is poking.
On regards to UK becoming "small Britain", well, your comment is right... just 107 years old because it started with WW I.
However, you decided to extradite dissident to USA, which is as good as killing him
Also, how many IRA members got killed by good old fashioned bullet, and across the globe?
(or even innocent bystanders like this one)
https://www.theguardian.com/uk/2009/mar/08/menezes-tube-shooting-northern-ireland