Many takeaways contain dangerous colourings, bogus meat and potentially lethal nuts, according to analysis of chicken tikka masala and sweet and sour chicken from 223 takeaways.

One Indian meal contained 16 per cent more saturated fat than the maximum recommended for a day, the study for the Local Government Group found.

One in five Indian takeaways contained nuts, even though the customer stressed that they had a nut allergy, and illegally high levels of five artificial colourings linked to hyperactivity in children were found in 20 per cent of chicken tikka masala meals tested.