.
Great stuff
de Havilland 
(Although this would have been an ideal post for the
http://www.pprune.org/rotorheads/417...licopters.html thread).
To the best of my knowledge your list appears fairly accurate (and a most useful confirmation of the information I already possess).
Those 'in the know' include PPRuNer
Helipixman and
Paul Tomlin of Edendale Graphics both of whom have a substantial awareness of the various Ferranti fleets.
I would be intrigued to discover the background on 'Atticus' (G-ATUS) as I had always imagined that Denis operated this while it was registered to Quinton Hazell but, we may be entirely wrong (it wouldn't be the first time). Identifying the shield on the side of
Atticus might be a good start.
I am in touch with several members of the Ferranti family and will try and discover the origins behind the naming of 'HoverKnights'.
* * *
Some BEA nostalgia:
Bell 47B of British European Airways (BEA) known as 'Sir Balan' at White Waltham in June 1952. The craft was operated by BEA's experimental helicopter unit. (Photo: Frank Hudson)
S.