It's hardly likely other terrorists are going to stop by when the occupants have already been taken into custody (and probably cordoned off outside the picture?) I would assume the WPC is simply there to check credentials of officials who need to enter.
Anyway, we need all our trooper-like armoured guards to make sure there's no pushing in at Heathrow - airport crowds can get pretty tetchy.
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Life's hard you know, so strike a pose on a Cadillac
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