Franco.. Half wit?
Umm.. No
Braindead Boris would have problems out thinking one of the zombies from Shawn of the Dead.
Franco might have been the utter bastards utter bastard, but one thing he wasn't was an idiot. He was a very astute politician who managed to play off most of the rest of Europe during and after the war (not exactly rocket science to be sure) - including playing a game of hide and seek with Hitler and the Allies that kept Spain out of the war and completely unharmed (bar being broke from the SCW) - so it's deeply unfair to liken him to Bloody Stupid Johnson.
I'm in no way saying that I support the guy in any way and it wouldn't surprise me to find that Priti Patel has a poster of Franco on her bedroom wall (that she strokes lovingly with claw like fingers), but likening Boris to Franco is the same as likening "Duh-fender" McGovern and Ettore Bugatti.