What happened this morning to 138 @ LHR? Hear aborted landing JIT due to other aircraft on runway. Anyone know?
Assuming that by JIT you mean "just in time" then you're making this sound unnecessarily melodramatic.
Go-arounds (aka missed approaches) are a perfectly safe procedure and a pretty well daily event at Heathrow - there were 485 of them last year.
Hopefully we're not going to see a rash of posts every time one happens.