Tennis player Jamie Murray - the brother of British number one Andy Murray - was caught up in the queues at passport control on Thursday night.
He tweeted these pictures, estimating that there must be a couple of thousand people waiting in line.
He added the hashtag #thirdrunwayanyone?
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Darren Osborne, 48, allegedly mowed down worshippers attending Ramadan night prayers in June last year.
The woman was left with a fractured skull and an arm broken in several places after the attack in Brixton.
Isaiah's mother, Takesha Thomas, and father Lanre Haastrup from London, want treatment to continue.