I had a text from my sister so I called her back. She's got shingles. Her doctor commented that she could have got it in Tesco. I remarked that my doctor said the same when I had chicken pox.
My sister wonders if you get Clubcard points with it.
I think it's more sinister. Conspiracy theorists, on yer marks, get set, GO...
For everyone who's boycotting Tesco, it may just be another reason to add to your list...