Matilda, it sounds like you have a source for the good mushroom compost. The stuff in the bags is useless because it packs too much and has little organic structure left in it. I used to have a source for the mushroom compost made with straw and chicken manure and gypsum. I used it alone in some pots and grew tomatoes in it and they did better than any of the soil less mixes I have tried since then. It stays rather loose and drains well while feeding the plants good. If you have some why don't you try just filling a large container up with the mushroom compost and plant one tomato plant in it and see how it does. I think you will be pleasantly surprised.
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