It's right at the front. Get down on your hands and knees and look through the lower grill, towards the near side. You're after a small, black round thing about the size of your thumb.
I've changed a few Vauxhall ones, they are simply bayonet style fitment. I can't imagine the Jaguar/Ford one is much different? Try twisting it out from it's housing. If I'm wrong, I'll stand corrected.
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