The UK car industry suffered as did much UK industry in latter decades of the 20th century. The car making sector rallied thanks to overseas investment, and other areas such as car design got a reprieve. The effect on the economy was most beneficial, from taxes generated to the trickle down effect to suppliers and ultimately all businesses.
With Ford quitting its van production, it will be down to two makers of any consequence. Ownership of many companies has changed so I have tried to keep it as simple as possible. The point is the slide of volume . With GM never guaranteeing anything beyond the current model, and any future investment of note impossible to see this is as good as it will get. I guess the positive note is the car industry could have gone the same way but didn't.
Bedford truck picture source: click here
Ford Transit picture source: click here
Leyland-DAF picture source: click here
GM Vivaro picture source: click here