http://download.cabinetoffice.gov.uk/structure/Defra-Organisation-Chart.pdf
For the inquisitive the second Cabinet site gives salaries and stuff also does other depts.
http://www.cabinetoffice.gov.uk/newsroom/news_releases/2010/101015-structure-charts.aspx
For science and innovation see the BIS
http://download.cabinetoffice.gov.uk/structure/bis-org-chart.pdf