Of course the Iraq war is the cause!!! He was brought up Christian - if teh Iraq war hadn't happened and wasn't on television all the time in 2003, do you seriously think a teenager from Romford would have even known Islam existed? Nah, he'd have been trying to get a girlfriend.
In order to make conversions Islam a) has to be brought to massive public attention and b) in a way that makes the impressionable feel sympathetic to them. A lot of people felt the Iraq war was wrong at the time - a million marched in London over it and were horrified about the deaths there. In 2003 there were a lot of people who thought (correctly) that the Iraqis were being made to pay for what some Saudis did in 9/11 simply because they were the same religion, even though there was no Iraqi involvement in 9/11. Sort of collective punishment.
If Blair hadn't gone to war then this killer wouldn't have been influenced to convert. This is all Tone's fault.
I was there for the protests. I despise bush and his oil war. But it was Islam that caused the Nigerian to hack that solider to death not the Iraq war. Remember the 14 year old who was shot in the head because she wanted an education. Thats how bad Islam is. http://www.bbc.co.uk/news/uk-england-birmingham-19966357