A scaled back version of Gay Pride is underway in Westminster.There had been fears that Pride London, which also incorporates World Pride 2012, would be cancelled due to funding problems.
I'ts kicked off without a hitch, with a walking procession from Baker Street to Whitehall. But there will be no floats or other vehicles involved.
This will be followed celebrations in Trafalgar Square until 6pm.
Soho is expected to be busy throughout the day.
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Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.