From Calais: 570 miles - autoroute tolls about £35 each way - these can be paid in cash or by credit card.
On leaving the ferry follow autoroute(A26) signs to Reims, continue towards Troyes, then followingthe A5/A31 to Dijon and the A39(via Dole) to Bourge-en- Bresse. You then join the A40, the 'AutorouteBlanche' towards Chamonix. Leave the autoroute at Cluses, follow Taninges and then Les Gets.
There is a small but quite good hypermarket in Taninges. It is useful to stop here to fill up with cheap fuel. There is also a good selection of food and wine, although generally the two supermarkets and other specialist shops in Les Gets have a good variety.