...and therefore there is the chance that some, or all, of the conclusions you might draw from the survey, would be invalid because they would be based on invalid data.
Erm, given that you've sent this questionnaire to NSC, are you expecting many people to answer 'No' to the question 'Are you a football consumer or fan of a football club?' Isn't the question redundant?
In addition, as you conflate 'football consumer' and 'football fan' in that question, some...
If it's any consolation, it took me several minutes to work out that the question was not an either/or option, and that the OP considers the terms 'football consumer' and 'fan of a football club' as the same thing and are interchangeable. I think. Although I'm still not entirely sure...