Rents for allotments vary according to the size of the plot. Rent charges currently range from £25.80 to £53.10 for the year. Each plot is also subject to a yearly water charge that is currently £16.50.The annual allotment period runs from 1st February to 31st January.ents for allotments vary according to the size of the plot. Rent charges currently range from £25.80 to £53.10 for the year. Each plot is also subject to a yearly water charge that is currently £16.50. The annual allotment period runs from 1st February to 31st January.