MAN is a big bucket and spade airport. Let’s not get ahead of ourselves. MAN does have a lot of business travellers and a previously under estimated demand for J and even F class travel. But to call it a business airport is a misrepresentation IMO. Leisure, in whatever form that takes these days, is the bread that very much goes with the ‘business’ butter. If you were to take that away tomorrow, MAN would be a shadow of what it is today.
BHX will always struggle being sandwiched between the LON airports and MAN. Historically, in charter days, MAN and LGW were always favoured over BHX. The second city argument will continue to rumble on and be a bone of contention but if it was to be argued purely on airports, there really is no contest.