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B roads are numbered routes in Great Britain of lesser importance than A roads. See the article

Great Britain road numbering scheme The Great Britain road numbering scheme is a numbering scheme used to classify and identify all roads in Great Britain. Each road is given a single letter (which represents the road's category) and a subsequent number (between 1 and 4 digits). ...

for the rationale behind the numbers allocated.

Zone 6 (3 digits)

Zone 6 (4 digits)

References

{{DEFAULTSORT:B Roads in Zone 6 of the Great Britain Numbering Scheme 6 6