To be sung to the tune of When Britain Really Ruled the Waves, from the Savoy Operetta Iolanthe; or, The Peer and the Peri. You can click the next link to hear a version of the original on YouTube.
Since this is a rather topical entry, I'll include some notes for people who might be reading this at some time in the future:
I wrote this song as a comment on Britain's sad vote to leave the European Union, in a referendum of June 23, 2016. This proposed departure was dubbed "Brexit", a term created by merging the words "Britain" and "exit".
The term "Little England" may have been coined by a 2013 article in The Economist with the title Little England or Great Britain. Unfortunately, it seems that Britain may have chosen the former.
It's widely thought that the result of the referendum was driven in large part by nationalism and xenophobia, and that it will in the long term be a disaster for the United Kingdom (indeed, it may result in the UK breaking up). These forces are the same ones that are driving the presidential candidacy of Donald Trump in the United States.
When the results of the vote came in, Donald Trump was in Scotland visiting a couple of his golf courses there. He proceeded to send out one of his usual ignorant and tone-deaf tweets:
Since Scotland had, in fact, voted overwhelmingly in favor of remaining in the EU, the reaction on twitter was swift and furious. One of my favorite responses was from Terry McDermott, who wrote: