It refers to the council tax banding. Your banding will tell you what you pay. This is subject to lots of variables, including the value of your property and your local authority (they set the prices). Try this website for more info
http://www.direct.gov.uk/Diol1/DoItOnline/DoItOnlineArticles/fs/en?CONTENT_ID=4017252&chk=EdTU56
Maintainance and factors bills are a different charge all together!