This is the moment Tom Grennan surprised fans at a blind taste test at a local Tesco in his hometown.br br Customers at the store in Bedford were invited to sample different flavours of popchips [COR] while blindfolded.br br Upon removing their eye coverings, they were shocked to find themselves face-to-face with their favourite pop star and locally-born celeb, 29-year-old Tom.br br Unbeknownst to them, the Brit Awards-nominated star had swapped places with a staff member while the shoppers tried out the "better-for-you" snack.