The UK is all agog at the moment over the bugging of an MP’s conversations with one of his constituents, while the constituent was being held by police on (apparently credible) suspicion of terrorist offences. There seems to be quite a debate going back and forth about whether the “Wilson Doctrine” (basically forbidding the tapping of MPs’ telephones and commonly thought to also rule out bugging them in more modern ways) has any place in the new world order. I think this is a very easy question to answer, along game-theoretic lines not a million miles from those suggested by John in a post on the general subject of bugging and spying a couple of years ago. All one has to do is to remember the following fairly basic general principle, which would hardly make it onto the syllabus at most decent business schools because it’s so obvious:

If you create the presumption that the cops can hear anything that you tell an MP, then people will only tell their MP things that they would be happy to tell a cop

I would guess that there are plenty of people in the Muslim community in Tooting who would tell Sadiq Khan MP things that they would not tell the police. I would further surmise that the general security of the British public (ie me) is benefited to some small extent from the fact that there are people in the Muslim community in Tooting who would tell Sadiq Khan MP things that they would not tell the police. I rather suspect that the bod who decided to bug Sadiq Khan’s conversation with Babar Ahmad was concentrating purely on his own case and did not consider the more general ramifications of undermining the general principle that MPs conversations are not directly accessible to the police.