If you want the freshest sprouts for Christmas dinner you could grow your own. If you don't have your own garden, you could get a plot on an allotment. You'll need to find one first. Through our work on the Urban Commons project we started trying to improve and standardise the open data available about allotments in West Yorkshire. We've also been trying to improve the data available on Open Street Map. There are still some West Yorkshire allotments missing from the map so, if you know any, please help map them.