Your description of column headings is a start. It would be helpful to see how in particular how the various shop visits are noted (yours and others; it sounds as if they're all in the same column). At the very least, an image showing that. Even better: you could help ...
However, I cannot stop a user who has previously submitted a response from re-visiting that form and copying/sharing the questions and answers with other users. The only way appears to be by deleting all previous responses, but that stops me from collating data for...
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