I apologise to the House for missing the first part of what was obviously a comprehensive and thorough speech from the hon. Member for Orkney and Shetland (Mr. Wallace).
My hon. Friend just mentioned earth observation by satellite. Will he join me in pressing for the maximum use of that means of observation? It is a very fast-advancing technology and the Donaldson report is a little pessimistic about its use. It has a great role to play, not just in observation and tracking but in enforcement and deterrence, which are important in prevention.