The site, doctorsnotestore.com, carries the warning that the notes are for "novelty use only," The Daily Mail reports. That leads to the question of why someone would pay 25 pounds (nearly $50) for a novelty sick note.

The comments purporting to be from satisfied customers answer the question: "My employer didn't suspect a thing. I could have been fired for missing two weeks of work. It was wonderful doing business with you. Thank you!"

Investigators for the NHS say the forgeries are good ones, with a genuine-looking logo and the names of real hospitals and doctors. Only the signatures appear to be forged.

Buyers can choose a disease, how many days they need for recuperation and the hospital. The Web site tells them the notes will be available two days after they are ordered.