The C339 maintained by Cambridgeshire Council is the route of the former B1043 between Huntingdon and Alconbury. It runs along the route of the Roman Ermine Street.
It is described in the freedom of information request as being:
C339 ERMINE STREET LITTLE STUKELEY
C339 SLIP LANE FROM A1126 SPITTALS WAY TO B1043 ERMINE STREET THE STUKELEYS
C339 ERMINE STREET GREAT STUKELEY
C339 ERMINE STREET (C339) ALCONBURY
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