Don't judge a book by the cover - that is exactly what he wants you to do.
Boris is well educated (Eton and Oxford) and highly politicised. Even at Oxford he wormed his way to President of the Union by hiding his true colours.
He knows that by playing the buffoon he can disarm opponents and he plays it well. That makes him a lot more dangerous than people imagine. Trump looks like an idiot and thinks like one - Boris may look like one but underestimate him at your peril!