VR, GR and S37 ... In no way was my OP intended as a "dig" at the individual concerned (that is why I also edited the photo) ... it just happened to be the imagery on the front page of the Times yesterday that prompted my (genuine) question. Frankly I couldn't give a "Flying Fig" at what HRH does or wears off duty ... if done with good personal judgement. I also respect what he has achieved professionally and is now doing in theatre along with the dangers he and others face daily on our behalf.
So ... on balance in response to my OP, it would seem that Service Charity Bands are "officially" acceptable when on duty/in uniform ... but acceptability stops short of other "popular culture" statements/adornments/trinkets.
I'll continue to wear my H4H Band with pride ... but perhaps give the wearing of my Ancient Egyptian Fertility Symbol and Lucky Elephants Foot a miss !
Best ...
Coff.