To Calais take P&O or Stena Line from Dover or the Eurotunnel from Folkstone.
Eurotunnel is the most expensive, but also the fastest. If you book early you can get some good deals. P&O also travel from Portsmouth to Le Havre.
From the north, Hull to Zebrugge is a good option. Stena Line travel from Harwick to the Hook of Holland (close to Amsterdam).
To see what is happening on the roads in France, check out BisonFute, site run by the French government.
French law requires you to have a reflective vest handy in the car as well as an emergency warning triangle. Non-compliance could result in a 90-135 Euro fine.
In winter, it’s a legal requirement to carry a set of snow chains. Attention! Snowsocks for tyres do not conform to French regulations!
(Ouvert = Open; Fermé = Closed; Equipements Spéciaux Obligatoires = Special Equipement, i.e. Chains, is necessary)