Chapon, who has been with the company for 12 years, is credited with maintaining and developing the wine culture within Hotel du Vin (laid down by co-founder Gerard Basset) and Malmaison.
Bruce McKendrick, managing director of the group, said: "I would personally like to thank Henri for his support and service and wish him every success for the future."
Regional operations director Mike Warren will oversee the bar, bistro, sommeliers, wine dinners and Ecole du Vin functions within Hotel du Vin properties until further notice.
At Malmaison, group operations director Scott Harper will oversee brasserie, bars and sommeliers.
Basset returned to the UK hotel scene with the launch of TerraVina in Hampshire last year.
By Chris Druce
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