Charles Johnson has the early details.
Elsewhere, Tim Blair throws caution to the wind and suggests a group who may be behind the plot. Other than a few scattered incidents I can recall from my school days, they wouldn’t be my own first choice for a terror organization, but I admire his ability to quickly reach a conclusion and run with it…
Update: Lorie Byrd of Wizbang has an extensive and ongoing round-up of events as further details emerge.
More: This is satire, but the real official response from England will no doubt be along similar lines.