The sad part is that if she scews up someone will die.
Luckily the Met Police are on the outside of the Embassy and the US Marines,who know how to shoot,protect the inside.
When the crap hits the fan pull you and your people inside,Lock Down the post and call for help for those outside.
Can you initiate a suit in Britain for actions or inactions taken by local law enforcement??
We used to have an indoor range inside our barracks in London and Members of the Marine Detachment,Embassy Marines,Members of the Met armed unit and some local Special Units would come and shoot,compete for drinks in our club and we had Great Friendships and Understanding about qualifications ,control and expectations in regard to an incident near the Building/Embassy area.
I do not know if the Embassy Marines still do things like that,or if they care about the Met Perimeter,but shooting get togethers would get all on board as to what is expected of them.(including this shielded female accident waiting to happen)