I have just bought a one-year-old Volvo XC70 from a main dealer, as part of the Volvo approved used car scheme. The car has 20,000 miles on the clock, but came with the balance of the manufacturer's guarantee which was another two years. However, on reading the service book, the first service was undertaken outside the allowed 1000-mile tolerance, at 20,300 miles instead of 18,000. The problem is that I think that this will have negated the official guarantee. Can you advise?