Pastscape refers to this as a Temporary Camp, but Roman Britain calls it a Claudian era fort. It had double ditches, which is more common to a fort than a camp.
http://www.pastscape.org.uk/hob.aspx?hob_id=1366286
http://roman-britain.co.uk/places/droitwich.htm
http://www2.rgzm.de/transformation/unitedkingdom/smalltowns/Img03.htm