So how did the Birmingham 9 get the idea to kidnap and behead a hostage?
The Jawa Report :
In this two-minute audio clip, Omar Bakri Mohammed urges his followers to use whatever tools they have at their disposal in fighting the jihad. He claims those tools include beheading hostages. This message was recorded by Glen Jenvey on June 8, 2006--the day Abu Musab al Zarqawi, the leader of al Qaeda in Iraq who beheaded British hostage Ken Bigley, was killed.
Why bring this up now? Omar Bakri Mohammed's al Muhajiroun followers congregate in Birmingham. The voice you hear is that of Omar Barki Mohammed, many of those listening to him would have been in Birmingham. It's not a direct connection, but it may have been a motivating factor in the plot to kidnap and behead a British soldier. Especially given that those involved in the plot looked to Zarqawi's example. Add moral justification to example and you have a recipe for action.
[mp3 format, right click and "save as"]
Qur'an 8:12 "Your Lord inspired the angels with the message: ‘I will terrorize the unbelievers. Therefore smite them on their necks and every joint and incapacitate them. Strike off their heads and cut off each of their fingers and toes."