Supermarkets are limiting purchases of tomatoes, peppers, cucumbers and lettuce, as supply shortages lead to empty shelves. British farmers are struggling with higher energy costs, reducing their ability to grow certain fruits and vegetables under heat. Adverse weather in Northern Africa and Southern Europe has further led to a supply squeeze. Britain’s biggest supermarkets are limiting purchases of certain fruit and vegetables as supply shortages lead to empty shelves. Britain’s biggest supermarket chain, Tesco , has limited purchases of tomatoes, peppers and cucumbers to three items per customer. It said the move was due to poor weather conditions overseas and...