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shane3333

GPS: Garmin 65LMT 1490T 1350 265W







Post UK Postal Codes - how do they work     
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LL30 2HN - I have seen these codes on UK TV shows etc but never understood them. Are they like postcodes and how do they work?
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joegriffin

GPS: Garmin 765 for Volvo, Garmin Montana 600







Post Re: UK Postal Codes - how do they work     
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shane3333 wrote:
LL30 2HN - I have seen these codes on UK TV shows etc but never understood them. Are they like postcodes and how do they work?


They are the UK version of postal codes / zipcodes and they are structured data which works in the following way.

The format for the vast majority is <Letter>[Optional <Letter> <Digit>[optional <Digit>] <space> <Digit><Letter><Letter>

The initial (usually 2 but occasionally 1) letters indicate the postal region.

Each postal region is split into a number of zones, numbered sequentially.

This is followed by a space (to separate the zone from the next number)

There is then an area digit (1 - 9), to further restrict the location.

Finally there is a two-letter "Walk" designator which is a group of adjacent addresses. In a town, this would typically be one side of a street (the route the postman walks to drop off the mail) in rural areas, it might be an entire road or just a part thereof.

As an example, my postcode is "RH12 3DJ"

The Postal Town is Rehill in Surrey (which is where the main sorting office was when postcodes started).

We are in Zone 12 (Horsham and the villages to the West)

Area 3 is my village (Rudgwick)

We are walk DJ (the southern side of the North-Eastern end of Lynwick Street - 12 houses and 1 farm). The opposite side of the road is "DG" (22 houses). In the middle of "DG" is also the local Brickworks with its own dedicated postcode (DH). The Southwestern end of the road is DL (2 Farms with 8 dwellings) and DN (8 houses).

That way, the postcode drills down to a small group of addresses, so in theory a house name or number and postcode are sufficient to get there. Often (if the postman knows you, as ours in the village do) a name and postcode would be sufficient.

Hope that makes some sense and helps.
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shane3333

GPS: Garmin 65LMT 1490T 1350 265W







Post UK Postal Codes - how do they work     
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Thanks Joe,
Sounds rather straight forward when you put it like that.

Regards,
Shane
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usrjohn44

GPS: Garmin 1490T







Post FIQQ 1ZZ     
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Just to add a bit of confusion, there is also the code FIQQ 1ZZ which is a UK postcode for the Falkland Islands which was introduced in 2003.

This was because mail was often getting misdirected (probably to Falkirk in Scotland) and also because the islanders were often unable to make purchases using online mail order forms.
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joegriffin

GPS: Garmin 765 for Volvo, Garmin Montana 600







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usrjohn44 wrote:
Just to add a bit of confusion, there is also the code FIQQ 1ZZ which is a UK postcode for the Falkland Islands which was introduced in 2003.


Yes, there are a few odd ones. In my original comment, I did say "The format for the vast majority is "

There are some odd London ones like "EC5C 4XX" and there's also the one for the Giro bank GIR 0AA but the vast majority fit the pattern I gave.
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james-GDT44

GPS: Garmin







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The most interesting part about them is that public money is used to create maintain the database, but the public does not have direct access to it... other than a 1 at a time look up on royal mail's site, with a limit to 15 lookups a day...
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ppa-PDB44

GPS: diplomat







Post UK Post code structure     
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Also be advised that post codes may not always be immutable. I have noticed post code structures in certain towns such as Reading to change over time. If anyone needs UK post codes PM me.
I have 1.8 million in csv format
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adam_d_richardson

GPS: Apple iPhone 3GS







Post GB postcode data is available     
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The GB postcode data is actually freely available for the public to download under the OpenData program.
It is called Code Point - Open and is maintained by ordnance survey

The data includes every postcode (there are about 1.7 million of them) and the NHS codes and Admin districts and a few other bits and pieces.

The only problem is that the data comes with Northing and Eastings rather than Longitude and Latitude. The reasoning behind this is that the data is maintained by Ordnance Survey who are responsible are also responsible for mapping GB.
Please also note that this only covers England, Scotland and Wales as they are part of GB but the Channel Islands and Northern Ireland which are part of the UK but not GB have there own mapping and postal systems.
All the postcodes for Northern Ireland start with BT (for Belfast) and are looked after by Ordnance Survey Northern Ireland. Northern Ireland data is available but there seems to be a fee attached to this as the Open Data law does not apply in Northern Ireland.

There are a few different scripts around only (particularly in PHP) that will convert Northing and Easting into Latitude and Longitude which will make it usable for POI.
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Gaurav6400

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Post Building address to Postal code mapping     
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Can you please comment on how each house/building address is mapped to UK postal codes? Postal code code can only give the spread on map but how each house /building address is mapped to these postal codes? Thanks





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