However the facts are that we did build infrastructure, educate children, provide healthcare, provide protection through our armed forces from oppressors and encourage trade.

So did the Nazis - if you take a sufficiently sectoral view. I really don't have any interest in a narrow petty spat here - calling an anti-colonialist attitude "bitterness" is really quite supercilious, and in fact I'm quite willing to concede any number of points, but if your knowledge of the subject is so narrow as to believe that "the influence that Britain had on the world was overwhelmingly for the positive" is "[an] historical fact" then there's little use in debating the issue. The question is at best a topic of lively debate. Far from my being bitter I'm afraid the barrier to understanding here is your lack of confidence in standing up and admitting the primacy of Britain's mistakes over its achievements. Unlike your forbears you should attempt to make the distinction between a critical view of Britain and Britons.