I don't think they are royal!
Quite right Nigel, my mistake.
I can never get enough of the Blue Eagles in their Sioux days.
Here's something to be going on with:
Westland Sioux XT511 of the Blue Eagles Army display team as seen at Plymouth's Roborough Airport on 22nd July 1972 (Photo: Stephen Rendle)
Westland Siouxs of the Blue Eagles in practice near Middle Wallop on 18th June 1970 (Photo: Adrian Balch)
I have a considerable amount of Blue Eagles memorabilia stashed away in the UK including several large photos signed by the team from their Sioux flying days. Will dig them out when I next visit.