Costa Coffee is recalling four of its lunch products, including some wraps and sandwiches, over fears they could contain “small stones”.

In an announcement from the Food Standards Agency (FSA), the coffee shop chain said the food items “may present a choking hazard and are unsafe to eat”.

Costa added it was taking the recall “extremely seriously” and apologised to its customers.

The products being recalled are the BLT sandwich, chicken salad sandwich, southern fried chicken wrap and the chicken and bacon caesar wrap, with use-by dates between 6 September and 8 September.

“We are advising customers not to consume these products,” the FSA added.

“Any customers in possession of these products can return them to their nearest store where a full refund will be given.”

A Costa Coffee spokeswoman said: “Costa Coffee is recalling four savoury items.

“We have been notified by our supplier of a possible presence of small stones that could be a choking hazard if consumed.

“Customers who bought any of the products listed should not eat them and instead, please return to a store, with or without a receipt, for a full refund.

“We take this matter extremely seriously and sincerely apologise for any concern this recall has caused.”