Structure
The first three digits, the Residue Selection Code, corresponds to an area which can vary in size from one postal district to several postcode areas, although most codes correspond exactly to one postcode area. For example:
- 406 corresponds to the KA and ML postcode areas;
- 451 and 452 correspond to the LS postcode area;
- 491 corresponds to the London SW postal area; and
- 502 corresponds to the BN postcode area
The last two digits, called the Direct Selection code correspond to one or more postal districts.
Mailsort codes are sometimes prefixed by a letter (A-P) which corresponds to sixteen regional divisions of the country, although the letter does not form a part the mailsort code. The letter prefix is used by the sender to ensure that when mail is presented to Royal Mail those items with the furthest to travel are given and processed first while those in the same region as the sender are dealt with last. When mail is presented to Royal Mail it is therefore not given in strict mailsort sequence and furthermore the sequence used will differ from one location in the country to another.
Read more about this topic: Mailsort
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“The syntactic component of a grammar must specify, for each sentence, a deep structure that determines its semantic interpretation and a surface structure that determines its phonetic interpretation.”
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The great structure has become a minor house.
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The greenhouse never so badly needed paint.”
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