London (CNN Business) Pizza chain Domino's has spent £7 million ($8.5 million) to stockpile imported ingredients that might not be available if Britain crashes out of the European Union.

The UK arm of the American fast food company said in an earnings statement on Tuesday that a disorderly Brexit "carries the increased risk of disruption to raw material supplies."

The company imports about a third of its supplies from outside Britain including tomato sauce, frozen chicken, pineapple and tuna.

Fears of a disorderly break have increased after UK Prime Minister Boris Johnson doubled down on his threat to leave the European Union on October 31 even without a deal in place to protect trade

Business groups representing the food and beverage industry have cautioned that that shortages would be caused by disruption to supply chains and long lines at the border.