GB 59
The GB 59 postcode zone is centred around Llansadwrn. It represents 3 postcode-locality records in the source data.
The reference centre is calculated from available postcode locations and is not an official administrative boundary.
Using GB 59 in logistics
Freight planners commonly use leading postcode characters to describe a broad collection or delivery area. The GB 59 prefix gives a quick geographic reference around Llansadwrn, while the interactive map helps teams compare it with other European regions.
Always confirm the complete postcode, street and delivery address before pricing, routing or dispatching a vehicle. Prefix zones are planning references and may not follow administrative boundaries.
Reference data: Royal Mail postcode finder. Reviewed 19 August 2026.