Like many hundreds of London cyclists I went along to critical mass last Friday night. I’d heard about the possible crackdown by the Metropolitan Police under the Government’s new public order legislation and I wanted to express my right to ride. I’ve been riding in Critical Mass rides in London, Oxford and San Francisco for more than a decade and I’ve usually enjoyed the fun and friendship and the amazing feeling of riding along the city streets in large numbers, safely, showing how a bicycle can solve the problems of congestion.

Last Friday’s ride attracted more than 1000 people. It was an impressive show of solidarity, and to give them their due, the Police acted in an overwhelmingly friendly and cooperative way. But by the time the ride had reached Parliament Square and a group of people decided to brandish their bikes aloft and bring the ride to a complete standstill, I had decided enough was enough.

I’m glad I didn’t stay with the ride as it went back towards the West End but I’ve heard from others that people blocked Oxford Street for almost an hour, held up buses and generally caused disruption to everyone. Spare a though for all those shopworkers on minimum wage trying to get home on a dark Friday night. What kind of a message does that send out to people about cycling and cyclists?

Friday’s ride marked a turning point for me. London’s Critical Mass has always quietly tolerated those people who tried to hijack it for their own causes, whether they’re against Shell, McDonalds or the Iraq War. But now it seems that Critical Mass has inverted its own founding creed of being a bike ride not a protest. It is abundantly clear that it is now a protest, not a bike ride. And in doing so, it has become a convenient vehicle for the angry mob who like to be anti-everything.

Over the years Critical Mass has undoubtedly raised the profile of cycling and contributed in its own way to the massive growth of cycling in the capital. Riding a bike is now a perfectly ordinary way of getting around town, and Governments are broadly supportive, although it is always possible for them to do better. I ride my bike in London and see so many other riders around me that it feels like a Critical Mass every day.

A conversation I overheard on Friday sums it up perfectly. It was a bike messenger complaining, in very good humour, that he rode 100 miles a day, every day, and hadn’t had a mechanical failure for months. But he’d come on Critical Mass for the first time in years and been rear-ended by another rider, buckling his back wheel.

Cycling in London has moved on and Critical Mass now does more harm than good. But this doesn’t mean giving up on group riding, far from it. Any day of the month is a good day to get together with bunch of friends or join up with a local group like Southwark Cyclists for one of their regular Thursday night rides. 6.30pm on the South Side of London Bridge. I’ll see you there.