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Charles, yes that puzzled me too. Tomato is unnafected so far in mushroom compost. I have noticed that tomatoes have taken some time to show curling before, when I planted them in the manure which I first had problems with.. Where my first planting of Onions died, I planted tomatoes on that spot and they took some time to show curling in the new growth as did potatoes. This was also the case in my greenhouse where I saw some curling but thankfully I have had a good crop, although I did supplement with liquid tomato food.
I wrote to the supplier of Mushroom Compost to report my findings and all they had to say was that they have supplied several hundred cubic metres of horse manure based fertilisers and have had no reported problems. They did offer me a £20 voucher to use against another product, which I wont be using.
I received a similar response from the three other suppliers.