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ah, it's all over. It went very well as these things go - 20 or more ex-colleagues turned up, and lots of fellow garden club members too, all sorry to make their farewells but said they would never have dreamed of missing it, sad though it was. I've already had a month to get used to the hole in my life.
I tested negative this morning, but I still feel a bit crap, so I've been googling false negatives, and apparently it's not uncommon. I avoided kissing and hugging as far as I could and hopefully haven't damaged anyone's health.