The playground is very close to his home address. He plays out but has never gone missing before overnight - but has gone missing previously.
When we've spoken to people nearby they didn't know his name but when we showed a photo they knew who he was as a local boy.
Last night, a lot of searching went on with the helicopter and street searches. But we're now retracing our steps and carrying out new searches.
More top news
The A&E department at Northwick Park Hospital in north London has been under pressure following the closure of two other A&E units.
Martin Allen, 15, disappeared on his way home from school in London in 1979 and was never seen again.
Henry was charged following an incident near Jamie's Italian in Greenwich, south east London, on September 14.