United Kingdom postcode system
E365567
The United Kingdom postcode system is a hierarchical alphanumeric addressing scheme used across the UK to identify specific geographic areas, streets, and individual delivery points for efficient mail sorting and delivery.
All labels observed (5)
| Label | Occurrences |
|---|---|
| UK postcode system | 3 |
| United Kingdom postcode system canonical | 2 |
| London postcode area system | 1 |
| Royal Mail postcode system | 1 |
| UK national postcode network | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3525191 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: United Kingdom postcode system Context triple: [HX, partOf, United Kingdom postcode system]
-
A.
BN postcode area
The BN postcode area is a group of postal districts in southern England, primarily covering Brighton and surrounding parts of East and West Sussex.
-
B.
British National Grid
The British National Grid is the Ordnance Survey’s coordinate reference system used to map and locate positions across Great Britain with high precision.
-
C.
PA postcode area
The PA postcode area is a group of postal districts in western Scotland, covering towns such as Paisley and parts of Renfrewshire and Argyll and Bute.
-
D.
EC postcode area
The EC postcode area is a group of postal districts covering much of London's historic financial and business center, including the City of London.
-
E.
British Post Office
The British Post Office was the United Kingdom’s former state-run postal and telecommunications service, responsible for mail delivery, post offices, and early telegraph and telephone systems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: United Kingdom postcode system Target entity description: The United Kingdom postcode system is a hierarchical alphanumeric addressing scheme used across the UK to identify specific geographic areas, streets, and individual delivery points for efficient mail sorting and delivery.
-
A.
BN postcode area
The BN postcode area is a group of postal districts in southern England, primarily covering Brighton and surrounding parts of East and West Sussex.
-
B.
British National Grid
The British National Grid is the Ordnance Survey’s coordinate reference system used to map and locate positions across Great Britain with high precision.
-
C.
PA postcode area
The PA postcode area is a group of postal districts in western Scotland, covering towns such as Paisley and parts of Renfrewshire and Argyll and Bute.
-
D.
EC postcode area
The EC postcode area is a group of postal districts covering much of London's historic financial and business center, including the City of London.
-
E.
British Post Office
The British Post Office was the United Kingdom’s former state-run postal and telecommunications service, responsible for mail delivery, post offices, and early telegraph and telephone systems.
- F. None of above. chosen
Statements (66)
| Predicate | Object |
|---|---|
| instanceOf | postal code system ⓘ |
| administeredBy | Royal Mail ⓘ |
| alsoKnownAs |
Postcode Address File system
ⓘ
UK postcode system ⓘ |
| alsoUsedIn |
Channel Islands (crown dependencies)
ⓘ
surface form:
Channel Islands
Isle of Man (crown dependency) ⓘ
surface form:
Isle of Man
|
| characteristic |
alphanumeric
ⓘ
area-based ⓘ delivery-point specific ⓘ hierarchical ⓘ |
| component |
inward code
ⓘ
outward code ⓘ postcode area ⓘ postcode district ⓘ postcode sector ⓘ unit postcode ⓘ |
| constraint |
postcodes do not always align with administrative boundaries
ⓘ
postcodes may cross local authority boundaries ⓘ postcodes may not correspond to electoral boundaries ⓘ |
| country | United Kingdom ⓘ |
| dataProduct |
AddressBase
ⓘ
PostZon ⓘ Postcode Address File system ⓘ
surface form:
Postcode Address File
|
| formatExample |
B33 8TH
ⓘ
CR2 6XH ⓘ DN55 1PT ⓘ EC1A 1BB ⓘ M1 1AE ⓘ SW1A 1AA ⓘ W1A 0AX ⓘ |
| governingStandard |
Royal Mail
ⓘ
surface form:
Royal Mail addressing guidelines
|
| introduced | 1959 ⓘ |
| inwardCodeIncludes |
postcode sector
ⓘ
unit postcode ⓘ |
| linkedTo |
Ordnance Survey National Grid
ⓘ
surface form:
Ordnance Survey grid references
Unique Delivery Point Reference Number ⓘ latitude and longitude coordinates ⓘ |
| nationCovered |
England
ⓘ
Northern Ireland ⓘ Scotland ⓘ Wales ⓘ |
| outwardCodeIncludes |
postcode area
ⓘ
postcode district ⓘ |
| postcodeAreaCodeExample |
BT
ⓘ
EC ⓘ G ⓘ SW ⓘ |
| postcodeAreaCountApprox | 120 ⓘ |
| regulates | allocation of new postcodes ⓘ |
| spacePosition | before final three characters ⓘ |
| specialCase |
BFPO numbers
ⓘ
PO boxes ⓘ large user postcodes ⓘ non-geographic postcodes ⓘ |
| typicalLength | 5 to 7 characters including space ⓘ |
| usedFor |
addressing
ⓘ
demographic analysis ⓘ geocoding ⓘ location-based services ⓘ mail delivery ⓘ mail sorting ⓘ market segmentation ⓘ route planning ⓘ service area definition ⓘ |
| validationMethod |
address verification APIs
ⓘ
postcode lookup services ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: United Kingdom postcode system Description of subject: The United Kingdom postcode system is a hierarchical alphanumeric addressing scheme used across the UK to identify specific geographic areas, streets, and individual delivery points for efficient mail sorting and delivery.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
WA postcode area
this entity surface form:
UK postcode system
subject surface form:
PA postcode area
this entity surface form:
UK postcode system
subject surface form:
BL postcode area
this entity surface form:
UK postcode system
this entity surface form:
London postcode area system
this entity surface form:
UK national postcode network
this entity surface form:
Royal Mail postcode system