Super Output Areas-Lower (LSOA),
Super Output Areas-Middle (MSOA),
Census Output Areas (OA).
More ONS 2011 Boundaries can be found here.
Boundaries for these geographies have been generalised (to 20 metres) and clipped. You can find further information on these formats in the downloadable Boundary Guidance document on the Open Geography portal.
All these products are supplied under the Open Government Licence and Ordnance Survey Open Data terms and conditions.
