Can I thank Dr Hearn for commenting on Griffiths (2019) as one of my aims in writing the paper was to encourage discussion following the 2018 Engineering Geology Group Cambridge Conference on ‘Keeping lessons alive’. In terms of full disclosure, I should state that I have known Dr Hearn for over 30 years, have published papers with him, and regard him as one of the leading exponents in the world on using earth science field mapping to support engineering practice. Dr Hearn's comments are, as always, perceptive and thought-provoking, and in general I agree with them but would like to make a few comments.

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