Central London areas are divided into what are known as LONDON POSTCODES. Each small section of London is allocated a 1-3 letter prefix that corresponds to its compass location and then a following number and 2 letters to distinguish it from adjoining streets within that area.

How do UK postcodes work?

The postcodes are alphanumeric, and are variable in length: ranging from six to eight characters (including a space). Each postcode is divided into two parts separated by a single space: the outward code and the inward code respectively. ... The inward code includes the postcode sector and the postcode unit respectively.

How are postcodes determined?

The allocation of postcodes depends on the amount of mail received. ... The unit postcodes are used to find about 30 million actual addresses or delivery points, the minimum number of delivery points for a postcode is one, the maximum is 100, and on average the postcode is allocated to 17 delivery points.