Trade union activists at the traditional May Day march across the capital used this year's event to pay tribute to late RMT union leader Bob Crow and Labour MP Tony Benn.
TUC General Secretary Frances O'Grady said they would both be 'hugely missed'.
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Members of the RMT union on the Northern Line are planning to walk out on Monday after a driver was sacked for failing a breath test.
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.