A Post reader and cheese lover was deeply disturbed when he scanned the food label for the cheddar cheese from England he bought from ParknShop. And who can blame him? The label contains alarming information: 'Traces of fish, crustacean and tree nuts.' I don't know about you, but if I want fish, lobsters and shellfish, I would buy them separately, and not with my cheese. Next thing you know, the cheese you bought might have chicken and beef in it, too. 'I trust your cheese-eating readers will join me in demanding an urgent inquiry into how much fish, crustacean and tree nuts one should expect in a piece of mature cheddar,' he wrote. In reply, the supermarket chain said they were not ingredients but were mentioned as a precaution. Apparently, they were named in 'a disclaimer' because the food factory that processed the cheese also handled seafood. A ParknShop spokeswoman acknowledged the possibility of cross-contamination existed. 'But this doesn't mean they are contained in the cheese,' she said. We are not sure if this explanation is satisfactory. Can't those people keep their equipment clean?