There have been 24 people arrested in England, and another 7 in Pakistan (5 Pakistanis and two Britons). Age range from 17 to 35. Two woman (one with a 6th month old child the other pregnant). One of the arrested had converted to Islam. The rest I guess were already Islamic practitioners. One person who was arrested has been released from custody. It also seems the arrests have expanded to Italy where another 40 individuals have been alleged to be part of a similar attack.

http://www.bankofengland.co.uk/publications/news/2006/082.htm
That's the press release from the Bank of England which froze the assets of the arrested individuals. Their names are in the pdf.