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So, no value for your time and expertise ;)
You taught your apprentices well. Very very few I have come across are like that. They seem to be change the bit the computer says and no worries as the customer pays. Reminds of a few cars I have bought that had lots of parts changed and still didn't work. Mind you I have spent hours and get a real sense of accomplishment when I fix it.
Yeah £20 and how long did the work take of you time, at work rates ;)