The humble jar of honey might seem sweet and innocent, but experts warn that British shoppers have been getting stung when spending on this staple. Investigations have revealed that unscrupulous honey producers around the world bulk out their products with cheap sugars that are almost impossible to detect. However, scientists have now developed a test which can easily spot the difference between fake and real honey - without even opening the jar. The light-based technique can detect the unique chemical signature of real honey as well as the syrups that try to imitate it. While the test isn't readily available yet, experts told MailOnline that consumers may be able to spot the frauds in their cupboards using nothing more than their phone torch within five to 10 years.