UK:
Barrel Thief
https://www.barrelthief.co.uk/
Lebanon:
The Joël Robuchon cellars
https://www.joel-robuchon.com/fr/caves-boutiques-beyrouth.php
Languedoc:
Carcassonne
At Julien
http://www.chez-julien-carcassonne.fr/
Limoux
The winegrowers' workshop
http://www.atelier-des-vignerons.com/
Hauts de France
Compiegne:
In Vino
http://www.invino-lacaveaboire.fr/
Champagne
Reims:
The cellars of the forum
http://lescavesduforum.com/
Voted best wine merchant in France in 2017 by the RVF
And some restaurants (among others) that we like:
Carcassonne
The truffle workshop
https://www.barriere-truffes.com/
Lastours
The well of the treasure
http://www.lepuitsdutresor.com/
Trebes
The mill of Trèbes
Restaurant Le Moulin De Trèbes