Another quality piece from the Daily Mail!!! They are saying insiders said it was hushed up?!?! Yes it may not have been public but I am sure it was published in the internal safety briefs.
Chances are this happend in the dark. When approaching Heathrow at 0630 in the morning when it is dark the other aircraft approaching look a lot closer than they are when you are sitting down the back in economy as their lights are shining right at you as you turn onto finals and they are lining up behind.