Balfes Kingston are my shop of choice.
I recently had a ticking sound on my Trek Domane that two other reputable bike shops weren't able to diagnose (after the princely sum of £250 was charged).
Matt listened to me, took my bike on the test ride I asked him to, and within a minute the issue was identified (seatpost requiring grease and tightening). I could have cried with relief I was so grateful.
No replacement parts (and I can tell you that 6 month old bike has had just about every component replaced this week), no condescending remarks and a genuine willingness to help.
This high performing team is legendary - thank you so much, from one extremely grateful customer.