Thanks much for paging me, NAV.
Ivan, I apologize for the additional ping, but I think we could really use the perspective of a Londonistaner in this thread.
Muslims represent far too small a percentage of the population for this scenario to be conceivable.
I think we do need to take Islam more seriously as a threat, but this is definitely overblown.
Regards, Ivan
There are two further reasons why this scenario doesn't work - it assumes a traditional war between Islam and the West. We know for a fact that the Islamists are cowards - they won't fight soldiers directly, at best they'll do hit and run raids, and they'll victimise women and children on airplanes. Secondly, this also assumes that the Shia and Sunni have patched up their differences to the point where they're not fighting each other any longer. Unlikely.
Regards, Ivan