Worth noting that Police forces buy a vehicle to use for a fixed period of time...
Any requesition has to justify the vehicle being replaced, the due date/mileage for the disposal of the vehicle being replaced, the intended date/mileage for the disposal of the replacement being requested and the cost of that vehicle.
So your '60 plate X5 probably replaced a 2005/6 Range Rover with 200k+ on it, and given the budget constraints, it will probably be expected to do 5 years, regardless of mileage.
The reason for repair over replacement is two fold... firstly, unless it is written off, accident damage doesn't get declared at the point of sale, and therefore doesn't prejudice the value, meaning the force receives a better price. Secondly the force only pays about 2/3s retail less vat in the first place, making repair more cost effective against the vehicle value.
This is also why you can never find out the purchase price of a Police vehicle using an FOI request, they always get knocked back as business sensitive. If the Police only pay two thirds of the regular price, then at the time of sale, the car should be worth considerably less than a civilian equivalent, but generally, on condition and mileage alone they are the same price, which returns more money into the budget
