The system, which is still used now, consists of zones defined by arterial roads nominally starting in London (although the A6 always started outside the city), numbered clockwise from the A1 to the A6, and the A7, A8 and A9 numbered clockwise from Edinburgh. Roads in between take less important, longer numbers beginning with the zone number they are in. For example, the A20 is between the A2 and the A3. Roughly speaking, the shorter the number, the more important the road, so for example the A18 is more important than the A1077.
Go to source: Great Britain road numbering scheme - Wikipedia, the free encyclopedia
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