Houses of Parliament

Earlier, the procession began its journey outside Big Ben and the Houses of Parliament as the clock tower's famous bells rang out.

They will hope to rush it through both Houses of Parliament.

"We found this statistic: half a million people used to walk across Westminster Bridge, take a picture of the Houses of Parliament and then walk back north. The Southbank in 1993-94 was deserted."

"Parliament is a unique place, it's like a village, why shouldn't we have a bar? It's the Houses of Parliament, not Ibiza," one woman, who has worked in Parliament for nearly three decades, tells me.

Police are investigating a report that a woman had her drink spiked in one of the bars in the Houses of Parliament.