We had a GH Martel champagne guided cellar tour and tasting booked since last December and I recently received an email advising that Martel can no longer offer guided tours of their cellars and for "customer security have decided to close our cellars for an undetermined time".
I'm curious if others have found this to be a recent trend with other champagne houses that offer cellar tours? Sounds to me like they have become aware of a security threat.