The 1940s were long ago, and recent times have been terrible for Jaguar. First sold to Ford and mismanaged, then hastily offloaded at a loss to Tata in 2008, and floundering even worse ever since. Seems to me that they're now considered a mid-tier brand, probably somewhere below BMW.
Fair enough, but I think car people remember or know of the history, and they could in principle reclaim it with high end products like they once made. Almost all car manufacturers that are still around have gone through rough periods and had to revive their brand image.