The FCO has responsibility for the evacuation of Britsh nationals
.... I recall when once in MoD, being at a meeting with FCO about an NEO. The question was asked (chiefly for payment purposes!) as to where MoD responsibilities ended and FCO responsibilities started (and
vice versa). The answer was worthy of Sir Humphrey (the speaker subsequently got his K!):
FCO man: "Clearly ..... (pause, puts fingertips together on table) .... the FCO retains responsibilities ....... (pause, strokes flowing silver locks) ...... in those areas .... (pause, smiles at befuddled military folk) ..... for which it is responsible!"