sequester is offering details of eating disorder sufferers for 12p a head .
also offering information on people suffering from 43 different conditions .
diana doyle was plagued by cold calls after her details were sold by firm .
whistleblower says its ` madness ' so much personal information is available .
information on the pension pots of thousands of people was being sold for as little as five pence each just days ahead of major pension reforms ; .
sensitive medical details about sick and vulnerable people -- including those with bladder problems , arthritis and high blood pressure -- were being sold for 19p ; .
an online pharmacy had sold without proper consent the details of nhs patients using its site to order prescriptions ; .
schools , dentists and even a whitehall department bought data from unscrupulous firms trading in private information ; .
those whose information has been sold are now plagued by criminals trying to scam them on the telephone .