This business-planning atlas shows the boundaries and codes of all the postcode areas and districts in Great Britain on background maps at a scale of 4 miles to 1 inch, Northern Ireland on a scale of 9 miles to 1 inch, and both district and sector levels of postcode information for Central London at a scale of 3 inches to 1 mile. The introduction explains the usage of postcodes and some of their many applications, including market analysis, distribution planning and sales territory organization. An index to all postcode abbreviations is shown on the keymaps to assist the first-time user.