Since 29 April, there has been no shuttle service between Tignes les Brévières and Tignes 1800. If you live in Les Brévières, you can drive to the Blondin car park (Tignes 1800) and then take the free shuttle to Tignes le Lac.
A free shuttle bus runs between Tignes les Brévières and Tignes le Lac and also serves Val d'Isère. For more information clic there.