I suspect Boris is sleep deprived, also juggling too many things (including family demands) and therefore hadn't had a chance to put the preparation into that particular speech.
He also uses bluster to cover up times when he's searching for a word and so doesn't speak well "off the cuff". Everyone loses their place from time to time, it would have been better if he'd just said "sorry, I seem to have lost my place, I'll be with you in a minute" rather than faffing around....would have been less painful.
I also think he tries to make things personal and use anecdotes to make a point, but he needs to hone the way he does it. Instead of doing the "hands up who's been to Pepper Pig world" thing, he'd have been better going along the lines of, "as a dad I've been introduced to Pepper Pig world for the first time, but, when visiting recently, it struck me this could be my sort of world because.....etc., etc...."
I know it's 'fashionable' on MumsNet to hate the chap, but I'm prepared to give Boris the benefit of doubt. I think his heart's there but his delivery is often the problem....
(And yes, I'm on a minimum wage, rent my home, don't have a pension except the state pension and no, I also haven't had any time off this year...before anyone suggests otherwise).