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A UK Post Code is made up of a number of different parts like these; BS12 6LS or N1 1DF. All together these are known as Post Code Units. Only really large buildings or large mail users have an individual code unit all to themselves. Usually code units are shared between a number of different premises.
It is worth to note at this point that in a built up area an individual Post Code will represent a handful of houses all within a few 100 metres of each other whereas a Post Code unit in a remote or rural area may represent a group of dwellings many miles apart.
CB21 4NJ
CB21 4NU
CB21 4NX
CB21 4NY
CB21 4NZ
CB21 4PA
CB21 4PB
CB21 4PD
CB21 4PE
CB21 4PF
CB21 4PG
CB21 4PH
CB21 4PQ
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