Few Prime Ministers actually manage to change the countries they govern. In the past 80 years, only Winston Churchill, Clement Attlee, Margaret Thatcher, Harold Wilson and Tony Blair could claim to have done so – Wilson and Blair very much for the worse. Now, thanks to his achievement of a negotiated departure from the EU, Boris Johnson joins that number, and in this case the change is definitely for the better. Having won a majority that fashionable opinion said was unattainable, he has once again pulled off what almost everyone said was impossible. Four days from now, Britain will be a fully independent country again, for the first time in almost half a century.