The monthly ad hoc gathering of cyclists in central London, Critical Mass, have won their case in the House of Lords, against the Metropolitan Police, who have been harassing them for prior permission, names and addresses of the non-existent "organisers" etc.
The Judgment of the House of Lords:
HOUSE OF LORDS
 UKHL 69
This ruling is narrowly on the impossible requirements for notification of Processions under the Public Order Act 1986, but it also might have wider implications for spontaneous demonstrations which are still currently banned in the wretched Serious Organised Crime and Police Act 2005 section 132 Designated Area, which the Metropolitan Police have also harassed the cyclists with.