Silver Spoon said it had pulled around 11,000 bottles of its Strawberry Crusha Milkshake Mix from the Asda supermarket. A greater number of bottles are estimated to have already been bought by consumers. An apparent glitch in production appears to have meant the batch was not protected against microbiological growth and spoilage. It is thought consumer complaints may have raised the alarm, and initial tests suggested the problem had been caused by low acidity levels. "As a result, the company cannot be sure that this product will remain safe to consume and is therefore recalling it," the firm said. Up to three consumers reportedly vomited after drinking the milkshake. Silver Spoon, owned by British Sugar, warned consumers to watch out for a slight fizzing on opening, a pungent aroma, and a cloudy, gelatinous appearance or off flavour.