An allotment is an area of land, leased either from a private or local authority landlord, for the use of growing fruit and vegetables. In some cases this land will also be used for the growing of ornamental plants, and the keeping of hens, rabbits and bees. An allotment is traditionally measured in rods (perches or poles), an old measurement dating back to Anglo-Saxon times. 10 poles is the accepted size of an allotment, the equivalent of 250 square metres or about the size of a doubles tennis court.
If your allotment is on land owned by the local authority then it will either be classed a statutory or temporary site. Statutory sites are protected by law.