Mr. Simon O'Brien:

The security check, a security sweep, initially was in relation to a general level of risk to identify risks and mitigate these risks. I had nothing in my mind to say we were under surveillance. We clearly had issues in terms of information flows that might be difficult to understand or explain and the whole idea at first was to look at ourselves and our buildings to see what capability was ranged against us. It was after we had made that check that we had further suspicions and now we started to talk about specific threats. At the time there was an indication, a suspicion, that someone might have been surveilling GSOC. As the issues came forward, with two specific threats, found very close one after the other, anyone in a reasonable organisation, in taking reasonable steps to protect its security, would have had to think about what to do and how to try to mitigate these threats.