I’ve always used my small, local garage since I got my first ‘exotic’ car. When one of my sports cars was recalled, it had to go to the main dealer. Fresh real coffee, a tin of Quality Street to pick from while waiting and reading the free paper or watching the Bang & Olufson TV!! On a second recall, they gave me a series 5 Beamer for the day …. But, I noticed that the hourly charge for labour was 3 times my local garage - I’d hired barristers for less!!!
Obviously my local place has to pay whatever the spare parts cost and there’s no curtesy car, but I think I get better service and a lower bill.
As for affecting its value - as long as an accredited garage stamps your service book, it shouldn’t make any difference.
Twenty pounds ! What will you receive ?
Are books a thing of the past ?
