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Jon Finch · 12-07-2006, 03:09 PM

A bit of a UK centric question, but if anyone round the globe can help, feel free!

Royal Mail Recorded/Special Delivery letters contain a thirteen digit references in the form AA xxxx yyyy zGB where AA is any two letters, xxxx and yyyy are four digit numbers, z is a single number and GB is always GB. I'm pretty sure that z is a check digit calculated from the rest of the reference but can't find out how its done.

Anyone know?

12-07-2006, 03:09 PM	#1
Jon Finch Member Join Date: Nov 2005 Location: Cumbria Posts: 13	Royal Mail Reference Numbers A bit of a UK centric question, but if anyone round the globe can help, feel free! Royal Mail Recorded/Special Delivery letters contain a thirteen digit references in the form AA xxxx yyyy zGB where AA is any two letters, xxxx and yyyy are four digit numbers, z is a single number and GB is always GB. I'm pretty sure that z is a check digit calculated from the rest of the reference but can't find out how its done. Anyone know? __________________ Jon Finch CD & DVD duplication & replication

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