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If you are on a council site, the council can charge them a fee for clearing and making the plot good again, if your new to the committee why don't you download the Tenancy Agreement from St. Helens Council and see if the agreement can be adopted, its very good.Digmore.
We are on a private site and have a deposit. Looking at the state of empty plots, my guess is that very few actually get theirs back. I also estimate that is totally inadequate to cover the cost of the work done to clear sites. Which are often left covered in various types of litter. Though the incomer often gets various fruit bushes and rhubarb. Even a few weeks between tenants the plots get high in weeds but actually most are waist high in weeds when the plot holders give up. Those that are not are totally depleted in any kind of nutrient and might look more or less clear but are not in a fit state for growing anything.