Security services fear a failure to monitor all forms of communications effectively will hamper their ability to combat terrorists and serious criminals. Sir Stephen Lander, chairman of the Serious Organised Crime Agency, said: "Any significant reduction in the capability of law enforcement agencies to acquire and exploit intercept intelligence and evidential communications data would lead to more unsolved murders, more firearms on our streets, more successful robberies, more unresolved kidnaps, more harm from the use of Class A drugs, more illegal immigration and more unsolved serious crime."