Another Parliamentary Question and deliberately evasive and non-transparent non-Answer regarding the Wilson Doctrine:
Members: Electronic Surveillance
Mr. Maude: To ask the Prime Minister whether communications traffic data on telephone calls made (a) by and (b) to hon. Members is covered by the Wilson Doctrine. 
The Prime Minister: I set out the position on the Wilson Doctrine on 12 September 2007, Official Report, column 2103W.
This "Answer", presumably means that Communications Traffic Data on telephone calls by Members of Parliament (and the Lords) can be snooped on, including what should be legally privileged telephone communications to and from MP's constituents.
The Question does not ask about Communications Traffic Data regrading the log files generated by internet web browsing, email or instant messenger communications, or facsimile transmissions or postal mail communications.