Last night at the 30th September 2005 London Critical Mass a letter was distributed by cycle police to participants before the start of the ride. Here is a transcription.

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Metropolitan Police Service
CO11 Public Order Branch
New Scotland Yard
Broadway
London
SW11 OBG

Your reference: -
Our reference: -
Date: 29/09/2005

Critical Mass Cycle Demonstrations

Organisers of public processions are required by law to notify police at least 6 days before the event occurs of the date, time, proposed route and the name and address of an organiser. Failure to do so makes the event unlawful

Demonstrations within a designated area around Parliament must also be notified, and anyone taking part in an unauthorised demonstration commits an offence.

Police can impose conditions on processions, demonstrations and other assemblies, and participants render themselves liable to arrest if they fail to comply with those conditions.

These cycle protests are not lawful because no organiser has provided police the with the necessary notification. Your participation in this event could render you liable to prosecution. Police policy in facilitating these events is currently under review.

If you intend to organise a future similar event please refer to the Metropolitan Police website, www.met.police.uk for details. It is preferable for all parties if a lawful event can be safely facilitated, rather than the Police having to enforce legislation.

[signed]

Super intendent Gomm,
New Scotland Yard