Several MPs, including Deputy Leader of the Labour Party Harriet Harman and former Health Minister Dame Tessa Jowell, joined the protest this morning.
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Concern is growing for the welfare of a 28-year-old woman who has not been seen for more than two weeks.
A police officer in today's London Pride parade surprised his partner by proposing in the middle of the parade.
Record crowds are at this year's Pride in London parade as people show their support for the LGBT community after the Orlando shooting