Costa Coffee recalls sandwiches and wraps amid fears they contain stones

Retailer warns there may be small stones' in four products from its range and urges customers to return them for refund

Costa Coffee has recalled some of its range of sandwiches and wraps after it emerged that they could contain small stones.

The UK's largest high-street coffee chain warned customers that four of its products could be affected, and that they could pose a choking hazard if they were eaten.