For example my local ATS found a broken ball joint on my fiesta and told me the part was £75 - my local garage did the whole job for that.
The big names that people are worried about trusting garages and prey upon it.
Ironically its a "come to us you know our name you can trust us" sell
thing mst times you cant.
Best bet is to go by personal recommendation.
My view is that if you don't have that, you take a punt, go in and talk to them and if they seem open and straight give them a go.
Be suspicious if they can fit you in the same day - a good garage usually has a full job list for a fair few days