Getting there: Direct TER trains from Gare de l'Est (45 minutes, €15-25 depending on time). Book through SNCF Connect — No reservation required but check weekend schedules as service is reduced Sundays.

Champagne houses worth your time:

• G.H. Mumm: €25 tours with English guides, 34 Boulevard Henry Vasnier, most central location

• Taittinger: €35 for chalk cellars + 3 tastings, 9 Place Saint-Nicaise, more intimate experience in 4th-century Roman quarries

• Veuve Clicquot: €45 tours, 1 Place des Droits de l'Homme, book 2-3 weeks ahead for weekend slots

Don't miss: Reims Cathedral where 25 French kings were crowned, including Joan of Arc's Charles VII in 1429. Free entry, spectacular Gothic architecture rivaling Notre Dame but with 90% fewer crowds. The Chagall windows in the eastern chapel are stunning — Unlike anything in Paris.

Perfect timing: Catch the 8:47am train, visit cathedral first (opens 7:30am), champagne house tour around 11am, lunch in Place Drouet d'Erlon, return on the 6:24pm train. Unlike London's scattered day trip options requiring multiple connections, Reims packs UNESCO World Heritage sites and world-class wine into one compact, walkable city center.