Does Anyone Know Where I Can Find A List Of The Usrn Codes For Uk Roads?

[MagicSeven7]

I am looking for a list of USRN road codes for roads in the UK particularly Preston and Chorley.

Many thanks in advance.

[factor-fiction]

I admire your tenacity with these geocaching puzzles
This may help
http://www.thensg.org.uk/iansg/document.htm?targ=410

[Peter Pedant]

I goggled it and found this
http://www.thensg.org.uk/iansg/document.htm?targ=410

any good ? I didnt know what they were - and that they were changing

[emeritus]

http://en.wikipedia.org/wiki/National_Street_Gazetteer

[Old_Geezer]

Does this imply changes to road signs and the road IDs we all know, or is it a background activity ?