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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.
WD25 0GB
WD25 0GD
WD25 0GL
WD25 0GP
WD25 0GW
WD25 0JD
WD25 0JL
WD25 0JN
WD25 0JS
WD25 0JT
WD25 0JU
WD25 0JW
WD25 0JX
WD25 0JY
WD25 0JZ
WD25 0LA
WD25 0LB
WD25 0LG
WD25 0LJ
WD25 0PR
WD25 0SS
WD25 0UU
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