No pipes? No cigars? No brandy snifters?
According to the site http://gallica.bnf.fr/ark:/12148/btv1b530731481.r=Charlie+Chaplin+à+l%27hôtel+Claridge.langEN, the man on CC's left is Maurice de FERAUDY (62 years old at the time), which matches the images one can find of him on the web. However, the site identifies the man on CC's right as Maurice's son Jacques, which doesn't match others photos of him. I'm still thinking that there is no reason to doubt that that's really CAMI seated with CC.D.