Mike Brewer is only a minor niche celebrity he would be unknown to more 99.9999999% of people. Like you, I and absolutely everyone in the whole world he is a mere mortal. I have never understood any type of hero worship or celebrity, if you want to celebrate anyone then it should be doctors, nurses, firefighters, police, care workers and essential workers as they are the people you really need in life, Entertainers are good but not of much use in real crisis.
It was Ed China and Ant Anstead (now still 'Elvis'?) that done the mechanics and one of the reason's Ed China left was because the mechanical side was getting less and less for more entertainment. Give how long the show is it cannot show you much, just doing one job on a vehicle might take hours without the requirements of filming. Lots of work is done off camera it would always have to be that way.
Ed China although very tall is very down to earth, when not performing at a show he just walks about like a mere mortal, unlike some others, than Richard Hammond really fancies himself and thinks he is a lot more than he really is and as for Jeremy Clarkson when you see him you realise they can stack **** that high, he really is loathsome full of self-importance and feels very self-entitled, good entertainer but like us all with flaws as a person just that he seems to really embrace some of his flaws, he is one of these celebrities/ "heroes" that asks for some sort of (generous) payment to do 'free' work for charity, but then many do.