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Bottom bracket service plus chainring swap is about £35 in my neck of the woods. Add another £20 for the inspection time and risk*, and I think that’s a reasonable amount.
*madison sent an email saying shops were shielded from liability if a crank failed after inspection, but even taking the risk of assuming that were true and didn’t result in any legal peril, what shop would want the bad publicity and guilt resulting from a customer having a severe accident after their crank was cleared as not affected?
Did they remove it and take the rings off and clean everything? That's what they're supposed to do. Shimano has even given them 10 pages of instructions just for the cleaning. It's all in this Mapdec video which dubtap referred to https://youtu.be/HZLc3Ml4TXQ?si=wS6oIbstesAI50bg&t=352
How long does the inspecti0n take, and how much does the shop get paid for it?