Jordan Peterson shows us why Donald Trump’s IQ is likely to be be well above average. Many people must have worked this out for themselves via similar reasoning even if they are not keen on Trump or the notion of IQ. Some won't have worked it out, but we know about those people too.
In which case, by assessing their respective careers one might suggest that Theresa May is a little more intelligent than her detractors tend to imply and Jeremy Corbyn is as thick as a plank. Not to be taken too seriously of course, but compared to Trump, both May and Corbyn are probably rather dim.