The game must be played fairly, and that goes for both sides. My two cents as a suggestion for kindness: Let's assume that well-made replicas also mean image advertising for JLR, in a broader sense. Because the heritage of the brand is made visible and the heritage is so enormously important for the overall image of a brand. Then JLR could change its attitude and continue to accept such companies as Suffolk, for example. On the other hand, it has to be played fair. It is dishonest (without meaning anyone specifically) when classic car enthusiasm is feigned, and there is a business behind it.
My suggestion, the Vintage Jaguar aftermarket scene is accepted by JLR after individual examination. If there is a business background, the producer pays a license that is reasonable but does not kill him. So it would be a possible win win situation. At the same time, it must remain clearly recognizable externally that it is not an original.
I come up with the idea because that's how it works, for example, with the licenses of the BBC replica speakers. E.g. Doug Stirling has to pay a license fee to BBC for each pair of LS3/5a and other models. In return the speaker is officially approved and this is proudly shown on the label on the back.
JLR would have the advantage of a more positive emotional mood and more goodwill in the scene, especially since many of these collectors (and rebuilders) also need a new car, which could be a Jaguar.