Incase anyone planning to head south on A1 towards Newark, the road is currently closed by an accident and likely to be closed for a while. North seems to be open.
Due to all the low bridges, best route avoiding all low bridges is:
Off at A614 / A57 junction.
Follow A614 south to Ollerton / Nottingham.
By McDonalds, first left follow A614 Newark.
Rejoin A1 at Newark (not Tuxford or Retford).