We welcome this publication on vitrinite reflectance [VR] in British Carboniferous coals. There has been no unifying account for many years; the article demonstrates the value of inter-disciplinary and international collaboration. However, its brevity precludes a comprehensive review of available data and publications, and massed National Coal Board (NCB) data are excluded, which would greatly enhance understanding of maturity variations through the rock-volume, at different rates in very varied coalfields. Nor does the article include VR data from many modern boreholes drilled in un-mined areas - records available at the British Geological Survey (BGS).

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