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Postcode (May 2021) to OA (2021) to LSOA to MSOA to LTLA to UTLA to RGN to CT...
A best-fit lookup between postcodes, 2021 Census Output Areas (OA), LSOAs, MSOAs, LTLAs, UTLAs, regions (RGN), countries (CTRY) and nationalities (NAT) as at May 2021 in England...