Sir; Does The Grocer know its labels? Yes? No? Not really? Well the answer is: 'All of these.' Sorry, guys, but your quiz of the week on food labels was often wide of the mark ('Think you know your labels?', The Grocer, 18 August, p28). Yes, the Red Tractor means the food meets assured standards. But the flag in the logo is a clear and unambiguous indication of origin. So when you see the Union Flag it does mean that the food is UK-produced, and it does support UK farmers. Which, incidentally, is why the 'national tick scheme' you report in the same issue (p6) is so ill-conceived. Why 'GB Choice' did not speak to any of the key players in the industry before announcing their scheme is an altogether more challenging quiz question. But the prize for most difficult question of the week surely goes to: how did Defra manage to concoct such a bizarre research report claiming that the Red Tractor was failing to register with shoppers? (also p6). The results, and not only those concerning the Red Tractor, fly in the face of other reputable data. I pulled out another survey published just four months ago which indicated that 36% of people made a point of buying Red Tractor-labelled food, a result that differs from this Defra report by a factor of six. Who published this earlier report? Defra! (Public Tracking Survey 2006). This latest Defra report did not, in fact, test recognition of logos. The survey simply asked an obscure, confused and confusing question tagged on the back of a questionnaire about the environment that took 51 minutes to complete. The final multiple choice question is easy. Was the methodology bogus? Yes. The Editor writes: The Red Tractor logo denotes that it "meets assured food standards set in the UK". While no other country has successfully applied for a licence to use it, the emphasis is on standards rather than country of origin.