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It's great that you've found a good mechanic that is able to do the work and talk to you in a professional way.
Your story rings true to my ears. I've had so many problems getting proper service from bike shops. A long list of stories. I hate to say it but I think a lot of it comes down to sexism. I do all my own mechanics now. Not everyone has the luxury of time to learn properly how to do things.
My experience with Evans:
Took my bike for a service at Evans Chalk Farm, I tried to explain to them the problems my bike had and needed extra attention, I asked them to strip the bike fully to clean rusty parts (they didn't), I tried to explain to them that I could not figure out the strange noise that started coming out of the bike and to try to investigate to fix it (ongoing creaky noise for over 6 months) and they were looking at me as if I was crazy talking nonsense, instead of saying "yes we'll look at that" (ends up being the second hand shimano M53 pedal that needed repair which they never checked, I figured it out later on my own) and most annoyingly, when I picked up the bike and asked them to describe what was wrong with the bike and what was fixed/repaired (asking for a simple report on the service) their only response was repeatedly "it's all fine", as if women don't know how to talk mechanics (mind you, I'm an engineer).. I felt really horrible with the whole attitude.
Result: The London Bike Kitchen did a mint job for less and Tim was excellent in explaining to me of what to be mindful of on my next service and how much life is left on some critical parts. Sorry if you work at Evans...but I only buy heavily discounted things on sale online from there now...for what it's worth.