Without even trying I can justufy my opinion that manchester peaked in the aftermath of ww2, by listing the major employers that have disappeared. The biggest of them, Metropolitan-Vickers had nearly 30,000 full time employees, and supported hundreds of smaller suppliers, it's apprentice school turned out highly skilled fitters and engineers.
Down the road, Superheaters, ICI, Ciba-geigy, Rubber-regen, Carborundum Massey-ferguson, Cowburn and Cowper, the infamous Turners Asbestos, Manchester Liners, Crossley Engines,
that were loosely in Trafford Park. The word "park" is the salient point, it doesn't mean it was the biggest industrial area, it would fit about ten times into the Ruhr, but anyway...The east side where the Etihad stands lost thousands of jobs with the demise of the railways, Br, Bayer-Peacock and subsidiaries. Craven Bros, Storeys, Ferrantis, British Steel, Mirrlees, Union Carbide, Linotype, Miele, Dorma, Dunlop, Fairy Aviation, Vickers-Armstrong, English Electric. When Shell closed it's "cat-cracker" at Carrington, it took 100,000 pounds a week out of the local economy, apply that across the industrial waste land that is left, and i stand by my opinion that the future, with zero-hour contracts, robotised everything, the housing that replaced the slums now slums themselves, is grim for the vast majority.
But then, i haven't a clue, I only lived through it, FFS :(