Fairy rings are caused by fungus under the ground. To try and prevent the spreading of the fairy ring you can carefully cut any of the toadstools off at their base and place them in a container. Once you have collected all the toadstools burn them. Do not put them on the compost heap or redistribute them over the lawn or soil as they contain spores that will further the growth of the fungi. Burning the toadstools will destroy the spores.
You need to buy a fungicide to destroy the fungus underground. Be careful, if I remember correctly, it's very potent and dangerous stuff,
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Gardening
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obviously past this old ladies bedtime. 

