The reason I said that is I had a 15 reg transit connect which is basically a focus and water was pouring in up under the bulk head where at some point it had a tracker fitted which was removed, after removal the holes where it was fitted were not grommeted properly causing the leak.

to try and see where it’s getting in on your car do the hose pipe test with someone hosing the car whilst you’re inside, other than that it’s the old smoke test to try and ascertain where the water is getting in, water leaks are always a mare best of luck with it