There could have been RAF officers flying with FAA squadrons "on exchange" in the 1960s - there certainly was in the 1970s when it was ramped up considerably during the final cruise of HMS Ark Royal for the Phantom FG1 as well.
There are 2 x RAF officers in each of these photos - may both be Navs though.
809 Sqn 1963-1966:
Click on individual photos to zoom in:
https://photos.google.com/share/AF1Q...pPUml6eXhHVkln
801 Sqn here in 1966-67:
https://photos.google.com/share/AF1Q...ZTYmNGUnVNNWpB
801 Sqn here in 1968-1970 (both Navs):
https://photos.google.com/share/AF1Q...Q4aU9Hdm82Xy13