For activity from 2011-12 onwards, HES users are advised to use the field PCON_ONS instead of PCON. This field, which is derived from the patient's postcode in the field HOMEADD, defines the code for the English Westminster Parliamentary Constituency where the patient resides. Note that this field uses old-style geographical codes that were superseded in 2011 and are now no longer supported by ONS - the new-style code can be found in the field PCON_ONS.|For activity from 2011-12 onwards, HES users are advised to use the field PCON_ONS instead of PCON. This field, which is derived from the patient's postcode in the field HOMEADD, defines the code for the English Westminster Parliamentary Constituency where the patient resides. Note that this field uses old-style geographical codes that were superseded in 2011 and are now no longer supported by ONS - the new-style code can be found in the field PCON_ONS.

pcon