Do it yourself using "Chipex". Costs about £40 & will do all your chips. Check out YouTube videos of this system. If your guy is charging £35/chip, it soon mounts up.
I have used "Chipsaway" in the past. The one beside me is first class. There is probably one in your town. I always use them for smart repairs, paintwork, alloys, small dents. Far cheaper than the bodyshop & better with same day service