There might have been a time long past, think Balfour, Canning, Disraeli or Pitt the Younger, when being elected Prime Minister of this sceptred isle was a relative walk in the park, give or take the odd war, and it is truly amazing how many of the early cohort went for office two or three times. Today, no one, save the purblind, would want the role. Except current Prime Minister Boris Johnson, who has aspired to it with his every waking breath and lives in a state of perpetual motion, patience, perseverance and blind optimism as he has wrestled successively with a vacillating predecessor, a dysfunctional judiciary and an ego-driven Speaker. Just as he smote the rump of the Brexit mule to help it on its way, along came the…