I noticed that Bridgend (South Wales) is high on the list in your post.
"The Bridgend suicide incidents are a set of suicides involving young people in the South Wales county borough of Bridgend. Reports speculated that a "suicide cult" was to blame. As of December 29, 2008, there have been twenty-four known deaths since January 2007, though police have found no evidence to link the cases together. The Member of Parliament for Bridgend, Madeleine Moon has also said that there is no connection between the deaths."