But in the streets of Norwich, the Mexican staple is leading to a different kind of spice that has sparked a showdown between Taco Bell and the owners of a rival local firm.

Derek and Suzanne Hardy, food entrepreneurs who, between them, have launched several food businesses including City Taco on the market, have attempted to stop the fast food giant from opening later at its London Street restaurant.

The pair, who also run Don Txoco, a Spanish steakhouse in St Benedicts Street, claim noxious smells coming from the US chain's extractor fan are leaving them unable to sleep.

After finishing a day's work, they say they are unable to use their bedroom until the restaurant closes due to bad odours entering their home.

Old Post Office Court flats, where Mr and Mrs Hardy live, where they say bad smells from Taco Bell are causing them restless nights (Image: Owen Sennitt)

The unit is located at the back of the fast food chain’s site, near their flat in Old Post Office Court.

They say that because they are unable to spend time in their bedroom while the restaurant is in operation, they are forced to sleep on the sofa in their living room.

Taco Bell in London Street, Norwich (Image: Owen Sennitt)

In a letter to Norwich City Council, Mrs Hardy said: "Our wellbeing........

© Eastern Daily Press