Micah from Indymedia says,
Richard Allen, Liberal Democrat MP for Sheffield UK and Jeremy Corbyn (MP for Islington North) posed official Parlimentary questions to the Home Office about what happened with the Indymedia servers. Their response indicates that no UK law enforcement agencies were involved, see here for the full response:
Caroline Flint [holding answer 18 October 2004]: I can confirm that no UK law enforcement agencies were involved in the matter referred to in the question posed by the hon. Member for Sheffield, Hallam.
Link to previous BoingBoing coverage: one, two.