I got a price from LV= of £450 (+9-years NCD, 2 drivers over 60, rural). They require a tracker but are not strict about the type - I had a 'Chat' as follows: Q. I have a quotation for insurance of a Tesla Model s, for which you require that a tracker be fitted. Must it be a particular tracker? A. We don't recommend what make of Tracker is fitted, however if it meets the definition of 'a electronic system fitted to a vehicle which enables the owner or a third party to track the vehicle's location' then it's fine. All security and tracking devices should be active and in full working order and a network subscription, for any tracking device which we insist is fitted to the car, must be current and operable. Q.So you don't specify a category of tracker - 5, 6, 7 etc? A.That's right, we don't specify what type. I was told yesterday by a Tesla delivery man that they are working on getting their tracker approved by Thatcham.