You make a good point about the supply chain jobs that are below the headline. Borg Warner, Ford, Lucas - all massive concerns in their own right. A bike assembly line is way smaller than most of those second tier suppliers. In the past there was (poncey word alert) the ecosystem of auto, aero, defence, marine, civil engineering etc and hundreds of sub component factories. The bike industry in the the midlands had everyting on its doorstep and nestled in between lots of heavy industries.
And if you started from scratch now in the UK you'd be buying rims from Kinlin and hubs from Formula and ready made frames - all from the Far East. The bike valley in Portugal looks like a minor miracle but it does sit on a century of bike building and crucually they're both a lower wage economy than the UK and in the EU, which makes them a great bet for outside investment.