The Labour Party has published a video message from leader Ed Miliband in support of the London Pride parade.
"It promised to be a very, very important year if we can get the same-sex marriage bill passed," said Miliband.
"I'm proud to support that bill because I believe that the gender of the person you love shouldn't determine whether you can marry them."
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The measures are set to be included in a court-mandated clean air strategy the Government is due to publish on Wednesday.