first be trying to contain the number of attendees who are coming along and the number of visitors. but it will also be ensuring that not only the royal family members but all the dignitaries are safe and can move securely and quickly from one location to the other. obviously the risk has to be in the forefront of everyone s minds. we re at the second highest level. a terror attack is likely. a royal wedding would be seen as the most ideal type of event to target by extremist groups. can they search everyone that comes in here? there will be tens of thousands of people. is that possible? it s impossible to search every person. but the complexity will be