Claire

look in your local free paper - are there any gardening ads? Near me there are a couple of small businesses who advertise and will deliver compost and top soil in bulk bags (by the tonne). Also we have a hardware store that sells everything from a single screw to washing machines and they are happy to put stuff in their truck and drop it off. Builders merchants might also supply landscaping materials and compost. Ring up and ask!
Good luck,

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Julie