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Postcode area - first letter or first two letters of the postcode e.g. B (Birmingham) or BH (Brighton).

Postcode district - consists of the first number/two numbers of a postcode e.g. B1, B12 or BH1, BH12.

Postcode sector - is detailed by the first number in the second part of a postcode e.g. B1 1, B12 1 or BH1 1 or BH12 1.