You can buy a mileage bolt-on if you prefer. It will save you money compared to excess mileage fees. And if it does happen to correct itself later on then you can carry over this mileage credit for up to a year for peace of mind from the overage. Get in touch with Onto customer service if you’re concerned that it’s not accurate. Leave the key at home, unlock, drive, and lock the car again using only the app and this should force a mileage update to the Onto servers to make sure it’s definitely correct.
Regarding servicing, call Driverline to get booked in. 0345 0348 647. They will tell you if your car actually needs a service, or if it’s just the service light that needs resetting instead. There was a software bug that led to cars saying they needed a service before it was actually due, and I know this was mostly Peugeot models at fault. They’ll let you know when you call! If it does need to go in, then they’ll ask you which local dealer you would like to use, and any dates or times that wouldn’t be suitable. They’ll book it and send you a confirmation.
If you need a courtesy car, let them know at the time of calling up to book it in. They’ll request this for you but it will mean you wait longer for the service. Note that you’ll likely be given an ICE Car, but you can claim back fuel expenses on a pro-rata basis in line with your daily subscription allowance. Driverline will also email you a copy of the insurance certificate. Make sure you bring this along to the dealer to avoid having to pay for additional insurance on their car.