None of these are red flags. Al-Qaeda might be fundamentalist arseholes, but they're not stupid. Imagine you've been to a terrorist training camp. You're packing your bags to fly home to the US. Are you going to pack a bullet, a box of Bin Laden crackers and a Burqa? It's like arresting a kid in a Hamburglar outfit because he's got a mask, a striped shirt and a swag bag.

The obvious red flags aren't red flags because they're obvious. If someone isn't smart enough to realise that, they're not smart enough to pose any real threat. We're dealing with focused people who know that huge resources are going into finding them. What we're looking for is people trying to conceal their actions and obfuscate their movements. By jumping on a chair and screaming "Aaaagh, terrorist!" every time we see a piece of Islamica, we're just reinforcing the idea that people are suspicious for 'looking Muslim'.