This geodata pack provides the CDRC comparison retail catchments for the year 2017 for the retail centres of Great Britain. The data represent the maximum likely catchment area for the 2017 retail centres based on their size. They were created by calculating the isochrones (based on shortest road network distance) of the comparison retail centres. The data are provided in geopackage format that is supported by open source software such as QGIS and R.