official complaint bodies.

ABC (Aduit Bureau Of Circulation) -

I found this link which apparently shows the reply of ABC to a complaint.
http://urbanlegends.about.com/library/blneugent.htm

NRS (National Readership Survey)
PPA (Periodicals Publishers Assocation)
PCC (Press Complaints Commission)
Advertising Association
Advertising Standards Authority
Broadcast Advertising Clearance Centre
Ofcom