Doner kebabs were never likely to be cornerstones of a calorie-controlled diet, but just reading the contents in samples of the Turkish dish that became a staple of British takeaways may be enough to give you a heart attack.

Food standards officers who analysed nearly 500 kebabs to check meat content, labelling and nutritional value found "shocking" levels of fat and salt, inaccurate labelling of meat and, on average, enough calories to provide half a woman's recommended daily intake.

Six kebabs tested by local councils contained pork, in a dish that originates from a predominantly Muslim country and that many people assume to consist of lamb. Two of these even claimed to be Halal...