Central Postcode Directory - Supporting documents Date published: 10 September 2025 Research and support: Geography, Central Postcode Directory Documents Guidance notes Adobe PDF (1 MB) Introduction to postal geography and geo-referencing Adobe PDF (287 KB) CPD methodology flow chart Adobe PDF (95 KB) Advice on linking CPD tables Adobe PDF (87 KB) CPD accuracy by geography Microsoft Excel (1 MB) Help viewing documents
