Spinner: This is an ideal question for RVDT and or JimL.
In the meantime what I can say is that REEM is one of the few British registered helicopters engaged in yacht-borne operations. Most are registered outside of Europe. You can read more about REEM and her vessel, Kingdom 5-KR (used in the James Bond film 'Never Say Never Again'), one page
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One wonders what distinction EASA makes between private and commercial operations to and from private yachts?