Do you mean Pre 2020 
If it's post 2020 then that's presumably thriving since the EV rules 
Takes time. Rubbish Net zero was announced towards end of 2019. Which we then had the planned pandemic to cut emissions.
JLR was doing well, but as the deadline to drive these rubbish washing machines approach and the cheap Chinese crap has entered the market. The downfall has started after that.
Net Zero opened the way for chines rubbish to flood UK markets. As they have slowly flooded it, other manufacturers have lost sales. Also penalties from the useless government.
Tories and Reform were going to relax net zero, Labour scum not.
All has a knock on effect to Jobs, less sales means local people in the JLR supply chain loosing jobs.
Net zero is the downfall of Europe. All it has allowed is cheap chines cars to flood the market and get sales the Europeans had.
Without it, lovely 320d would still be selling like hotcakes and focus and fiestas.
Now we have Jeacos 7