Claim: There is no single-digit A road in Zone 8 of the Great Britain numbering scheme after A8 was reclassified into a different zone.
Evidence: A8 
A2 London to Dover, (The southern part of Watling Street, also known as the Dover Road), however, the A2 beyond Rochester has been replaced by the M2. 
A3 London to Portsmouth, (Also known as the Portsmouth Road)