"Change can only come from local citizens and politicians - it cannot be imposed by well-meaning foreigners - not least because a society like Afghanistan or Iraq is suspicious of outsiders and often resistant to change. I am not going to get drawn into the ethics of intervening in other countries. My concern is the practical question. Can you actually achieve change in this way? My guess is we can stop wars sometimes as in the Balkans and topple regimes - but that the other stuff - such as corruption is not within our power to effect and alter."