Who came first,Spiral Tribe or N23?

Twenty three members of the group were arrested immediately after the Castlemorton event and were subsequently charged under the Criminal Justice and Public Order Act 1994. Their trial became one of the longest running and most expensive cases in legal history, lasting four months and costing the UK tax payer £4 million.
is a bit of a coincidence if it's nothing to do with the origin of the name.
http://en.wikipedia.org/wiki/Spiral_Tribe