A whisky-bottling station was seen in Le Comptoir de Carteret (the website of which, LeComptoirDeCarteret.fr, seems not to be working), 10 rue de Paris 50270 Barneville-Carteret, +33 2 33 53 81 07. (This shop also sold Port.)
The shop-keeper said that such bottling is about to become illegal — all whisky subsequently being bottled in Scotland.