Temperatures have now reached 33.5 °C at Heathrow - the hottest temperature recorded since 20 July 2006
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Spray cans were found near the bodies on tracks near a south London station.
Some 81% of passengers are satisfied with their journey, down three percentage points from spring 2017.
Politicians, police, members of the public and the family of terror victim Makram Ali paid their respects at a ceremony in Finsbury Park.