A V Dicey defined the rule of law under three heads:

1. There should be no punishment except for breaches of the law.
2. Everyone is subject to the law and equal before it.
   
3. The law of the constitution is a consequence of the rights of individuals as defined by the courts.

These simple concepts seem to have eluded our political masters though. The Telegraph reports today that, apart from withholding information from the police enquiry into loans for peerages, Downing Street has been making it know that

the Prime Minister is happy to co-operate [with the enquiry] but should be interviewed as a witness.

I can't think of any other case in which the subject of a police investigation would even think of attempting to define how he is interviewed by them.  

I hope Yates of the Yard has no truck with this sort of posturing. If he prevaricates: nick 'im.