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I would try electric.auto and call them as I had a deal for less than that with sport wheels and midnight silver, same deposit, mileage and term as you too.
It could be your larger deposit makes the Tesla PCH the better pricing?
I used Electric.Auto (Zen Auto) and they were better for M3LR, Midnight Silver, 19" wheels.
£2956 + 47months @ £549.60 10k miles, and no processing fees.