Might be best off getting a pallet load of bagged stuff delivered if you're really worried about the farm stuff being contaminated. Levington have confirmed that their stuff is safe, and can be bought in bulk from various outlets. I think Crocus do it, and CPL Distribution

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Sarah

“Tell me one last thing,” said Harry. “Is this real? Or has this been happening inside my head?”
“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”