Hi DaveAndrew's posting supports my posting for Copinsay (Msg.13) that Acott was on sortie F/32 on 27Apr'42.
The fact that Cusson's is noted as having flown with Acott is in my view a bit of a red herring, and to me indicates he may have flown out to investigate any problems Acott was having. Almost without exception, all R.A.F. PR sorties were flown alone, to the extent that if they saw another a/c standing orders were to turn away even if might be a friendly. In my experience exceptions to this are the Tac.R. pilots of the 2 T.A.F. who on ocassion undertook joint flights but even these would be assigned two sortie refs. Having stated my opinion will now probably end up with egg on my face - flannel on standby!
In summary for 27Apr'42 from Wick you have two operational sorties by Spitfires, being:-
F/31 De Puysseleer
F/32 Acott
The sortie by Hood on 22Jul'41 would also have been on his own, and if accompanied by another pilot I believe would have been duly recorded. As mentioned in the postings I believe this might be sortie N/236, and maybe Andrew's sources can confirm this.
For any of the PRU units the prefixes of the sortie codes e.g. F/xx can be used as a good indicator of which airfield the sorties were dispatched from.
Kind regards
Pierre