down. obviously, there is the triage side of things. but you lock it down and start gathering up everything forensically. it is a standard set of protocol. so you go through, gather up all the pieces, parts, fragments of the device and what does that give you? well, you might pick up serial number for a particular component. part of that perhaps. if you get lucky, that might take you to a purchase point for that particular component. what does that do? that might give you a credit card receipt or a way of purchase or footage from that particular location that gives you another operational lead. you have the dna that also works. you ve got the footage. but the only city in the u.k. that has more coverage than london or than manchester is london. it s basically number two. so you pull all those files out and it s confirmed that basically what they get is footage from the attack or arriving at or near the site.