Mr. Simon O'Brien:

We kept knowledge of the security sweep to a very tight group of individuals. I think it numbered no more than four or five. One cannot have a security sweep of a building while all of the staff are in the building. We took the decision to have it done late in the evening. There have been many reports of covert operations and black operations at night, but this was a sensible way to conduct an operation where we retained some form of confidentiality about the fact that it was being done. We could have that reasonable expectation. I wish to be clear that at this time we were looking at potentially external risks to information flows being seized or captured or us being surveilled externally. What is clearly the case is that we have a problem internally. That is a real issue. We had always warned staff over the period of time about different conversations and possible leaks. It was right that we had kept this very tight so that a small group of people could assess what the findings might be and then start to think about how we could mitigate or eradicate the risks found.