As an aside, I was on Wessex from 1986 to 1991 and the term ‘cab’ was only used to describe SH aircraft, as in my first post. I never heard it used on 22 Sqn.
Walter would be used in the singular, more than one Wessex and you would use the term ‘Wessii’ which is a very old way of describing plural units from the RFC usage of Albatrii (possibly from schoolboy Latin). I never heard anyone use Wessexes or the like.
A Sea King was just a Sea King although their personnel were known as ‘Queenies’, a Chinook was a ‘Wokka’ or a ‘Portaloo’ and a Puma was just a French thing with rotors that went the wrong way round.
Hope that’s cleared that up……….