BBC Story
Summary: individuals scales airport fence, is chased by security, approaches BA 747 waiting for TO, security back off due to hazard of approaching aircraft preparing for TO, security apparently inform people. a/c takes off (not clear the order of last two steps), individual not found after a/c leaves, a/c
continues to LHR, body found at LHR.
Why on earth continue the flight?
1. You're pretty much certain to kill this guy. OK, it's "his fault" but still ...
2. Security just spotted an unauthorized person approach a plane. They don't know what he did to it - is he onboard with a set of wirecutters taking it apart? Did he chuck a bomb in the UC bay? Is he onboard, with said bomb? We appear to be paranoid some of the time, but not this time, when it would seem to have been far more warranted.
Perhaps if they'd seen him with a bottle of water things would have been different?