Dalton John Prytherch is in the LG http://www.london-gazette.co.uk/issues/35667/pages/3557 with No.91 Sqn in August 1942 receiving a DFM, interestingly the same NCO service number appears in February 1941 (http://www.london-gazette.co.uk/issues/35076/pages/905) against a different name. And to add to the whole problem Prytherch's officer service number as given by the CWGC appears against a different officer in the LG, a George Foggon.
Alan Clark
Peak District Air Accident Research
http://www.peakdistrictaircrashes.co.uk/
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