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Servicing on all VAG group vehicles can be done on a Time and Distance basis where servicing is carried out once a year or at 10000 miles whichever comes first. For higher mileage vehicles there is also the option to have the service carried out on a Flexible Service Schedule where the Servicing is carried out approx 2 years or 18000 miles when the Service Light shows it require a service.
You won't go far wrong with anything VAG group.
If you are looking for a vehicle of that sort of size have you considered a Skoda Octavia? There are some good deals on year old vehicles with approx 10000 miles on the clock!
The vehicle to go for is personal preference. Only you can decide!
As for warranties the manufacturers extended warranties are the better option. An awful lot of other warranties aren't worth the paper they arer written on!