LONDON – A sheep farmer was sentenced to 14 years in prison Monday for his plot to use baby food laced with metal shards to blackmail one of Britain's biggest supermarket chains.Nigel Wright planted jars of the contaminated baby food in Tesco grocery stores and sent dozens of letters and emails to the supermarket company in a bid to extort 1.4 million pounds ($1.8 million) in bitcoin between 2018 and February.Tesco had to issue a product recall after two mothers reported discovering pieces of metal in jars of Heinz baby food.