The Counter Terror Expo is the UK's largest buyers' fair for products designed to keep people safe from terrorist threats.
1. Robots play an increasingly huge role in fighting terrorism – they've been a feature in Afghanistan and Iraq for years.
Above is the Packbot 510 made by iRobot, with business development manager Mike Edis.
Boston-based iRobot has sold 10 million of its roombas, the robotic vacuum cleaning discs, but it's also a big deal in military technology. The Packbot is a bomb disposal robot designed to be carried on a solider's back - hence the name - which also can monitor radiation and chemical warfare threats. The company claims there are 6,000 of them in service, with NATO a key client. Edis claims his robots "save lives" and he has the emails from soldiers to prove it.
Edis has no doubts that the growth of the counter terrorism industry is proportionate the threats we face.
"None of us knows, we have an idea but but we don't know, what the next guy [terrorist] will be. The last problem in the UK was a stabbing, other than Northern Ireland which is still continuing. Unfortunately we cannot step back," he says.
"You'll see a lot of static protection devices here. We're starting to see bins come back to the streets of the UK - slowly. Some of those are protected.
"What's around the corner? Who knows... Everyone is still preparing. Is it worth it, is it of value? If we sit back we just let the people walk in and we've let that happen again and again. It will happen again but we've got to be as well prepared as we can."
2. If all else fails, you can always strap a camera to a dog.
3. If you haven't got a dog you could throw this cameraball through the window of a building you'd like to storm.
4. This is a dummy used by police and the military for target practice. It is quite menacing.
No one from McQueen Targets, which makes all manner of things for people to shoot at, could explain why he looks a bit like Arsenal manager Arsene Wenger.
5. McQueen also makes these target practice aids, which you can turn around after you've emptied your clip and see which vital organs you would have hit.
As the sales rep, Michael Lackie, tells me: "There are a lot of places you can hit someone and not bring them down."