If you are unable to specify producers or farms by name then use generic phrases such as «All the meat sold comes from within 30 miles of this shop». (educationbusinessuk.net)
Always try to make your thank you note specific to the conversation you had; avoid generic phrases, and personalize the note so that it reflects the specifics of the interview. (thebalance.com)
A stock cover letter equals generic phrases and offers no specificity about the company, industry, or role you're applying for. (reed.co.uk)