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I am afraid I come from the old school that does not believe that children should be on an allotment unless they are interested in gardening. Where I am there are several families who have children as young as two who quite happily dig and plant. They pose no problems whatsoever. I personally go to my allotment for peace and quiet I do not want hoards of children playing. My site is for purest allotmenteers and I would suggest that if children want to play they are taken to a proper playground.