Paul Wilson, 38, suffered severe anaphylactic shock and died in January 2014 after eating a takeaway containing peanuts.

Mohammed Zaman, 52, owner of the Indian Garden in Easingwold, Yorkshire, was found guilty at Teesside Crown Court.

Khan, said: “This callous individual has done enormous damage to the hardworking restaurateurs and their staff, who exercise meticulous customer care and strive to build their businesses.

“This was a needless tragedy and our thoughts go out to the victim’s family.”

The court heard that Zaman had cut corners by using cheaper ingredients containing peanuts. He denied he was responsible, but a jury was told he switched almond powder for a cheaper ground nut mix, which contained peanuts.

Mr Wilson, a bar manager from Helperby, North Yorkshire, specified "no nuts" when he ordered a chicken tikka masala - an instruction which was written on his order and on the lid of his takeaway.

He died three weeks after a different customer with a peanut allergy bought a meal from one of Mr Zaman's six restaurants and had a reaction requiring hospital treatment.

Alan Pratten, managing director of Arthur J. Gallagher’s Major Risks Practice and a specialist in the food and drink sector, said: "This case is a tragic reminder that accurate labelling, customer safety and allergen awareness are huge issues not just for takeaways and small businesses but for large companies too.

"Knowledge and traceability of products within the supply chain and appropriate labelling and communication notices are key. Good housekeeping at your own site is essential in food provision - that is a given - but the physical review of suppliers to assess their own food segregation and risk management is also vital.

"Business owners may sometimes think they have passed the risk back to a supplier contractually but that will likely be of little help if they are criminally prosecuted or the supplier’s subsidiary with whom they trade is placed into insolvency. The value of good risk management and appropriate insurance protection should never be underestimated.”