So have you, Laurence, yet deduced on which one your late third cousin gained his Certificate?
The photograph, to which you referred in your post of yesterday, appears to shows seven Moths (if one assumes that to be the identity of the aeroplane, whose undercarriage alone is displayed, beyond the Stinson). However without any indication of when, in the thirties, it was taken, one cannot aver that there were another two Moths in the Club's fleet at the outbreak of war. The photograph only offers a clue as to the identity of one of those Moths depicted. That appears to be G-EBVK, a DH.60X Moth that crashed (for the third time!) at Broxbourne on 06.07.37. It is recorded as having been damaged beyond repair in that crash (registration cancelled by the ARB the following year). So presumably that phtograph was taken not later than July 1937.