The B6423 was a short link in the centre of Worksop which paralleled the A57 route to the north. From the crossroads where the A60 met the A57 it headed east along Newcastle Street and Memorial Avenue, before turning south down Priorswell Road to terminate on the A57 again. Newcastle Street is now part of the B6024 whilst the remainder is now unclassified.
Curiously, although it may be a result of scanning the maps into the computer, the available online mapping suggests that this route was regularly labelled as the B6425 at 1:10560 / 10000 scales. However, the 1:2500 map shows B6423 and on balance this seems more probable, with no other known use whilst the B6425 number was being used elsewhere at the same time.