Doctor joke

A doctor is attending one of his patients who has a small complaint. "Here, why do you guys charge so much?" asks the inquisitive patient. "Well, we've got overheads to meet and, besides, you can get reimbursed through the National Health system" the doctor replies. "I see you drive a Bentley while I drive an old Cortina. Does that justify your fee?" the patient enquires. "Yes" the doctor says "because I'm a practising health professional and you're just a boring old Prime Minister".