On 1 July 1972 — timed deliberately to land near the Stonewall anniversary — a few hundred people marched from Trafalgar Square to Hyde Park in what's recognised as Britain's first Pride march.

It was a modest crowd by today's standards, but it set the template for what is today one of the world's largest pride parades. The timing matters: London's march didn't spring up independently of New York, it was a direct, deliberate echo of it — early evidence that Stonewall was starting a chain reaction.