I know.
India isn’t part of the EU, so that wouldn’t help Jaguar. BMW and Mercedes would have the German government supporting them in the committees that set the rules, but Jaguar wouldn’t have anyone.
Aston Martin is 37% Italian owned, but I’m not sure the Italian government would be that interested in backing them in negotiations.
There’s also Nissan, Honda and Toyota with large factories in the UK - big enough for the UK government to want to support them in EU committees. For Honda and Nissan, the UK factories are, I think, their only major car assembly plants in Europe. Nissan could rely on Renault to lobby for them, but it would be harder for Honda and possibly Toyota.
