I noted you cut out the part of my post that stated, they aren't the queen's body guards, that's what the close protection team are. Those CCTV watching people you refer too.
Queen's guard in the tower of London are guarding the tower not the monarch. They are not risking a head injury because their head dress falls off, no more than a paratrooper who's beret comes off. Helmets are worn in war zones where live amunition is highly likely. I mean if you want to see the queen's guard in combat gear, body plates and helmets then fine. But I think they'd prefer the uniform they have on now which is functional and they can perform their duties in.
The guards are also changed, every year. At horse guards parade during the monarchs birthday.
You have Irish guards, Welsh Guards, Scottish guards they rotate between ceremonial and asset guarding and then combat. You do know that "the guards" have been deployed to Afghanistan? It's not always the same regiment as such.
Thank you, I am aware of the various duties and postings of the Guards. My father and grandfather were officers in branches of the forces, as was an uncle of my grandmother's.
@WorraLiberty - these individuals ^^ were all Irish, as am I.
If there were ever any serious armed threat to the royal residences or installations, it would be detected by CCTV and dealt with by rooftop snipers, not the dressed-up-for-PA-purposes Guards. It's a ceremonial uniform, not a combat uniform.