Many thanks ExAscoteer2, that is very helpful. Interestingly, the entries "B" and "C" appear immediately below this, signed off about six weeks after the original entry. Do you know what they might mean? Also, a little later, the entries " 'T' Flying" and " 'T' Meteorology" appear. Could you perhaps help me with the meaning of these please?
Thanks again, your help is much appreciated.
Andrew