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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.
NR20 3FH
NR20 3FJ
NR20 3FL
NR20 3LD
NR20 3LE
NR20 3LF
NR20 3LG
NR20 3LH
NR20 3LN
NR20 3LQ
NR20 3SL
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