Prevention and Suppression of Terrorism

I want to bring the Minister back to the narrower issues of the motion. He mentioned the control order review groups and he will be aware that Lord Carlile has talked about his increasing concern that there should be a finite limit on the period to which control orders should apply. He gave a figure of two years. Can the Minister help the House by saying in how many cases we are already beyond that two-year point and how the Government are responding to the issue?