Never had the pleasure of meeting Mr Wall, but fond memories of Nigel - sad news indeed.
My wife recalls the time a passenger approached him in one of the bars and asked him what she should do about her chronic diarrhoea. Nigel immediately called over a wine waiter and requested a bottle of Cristal champagne. The passenger remarked she didn't know that champagne was good for diarrhoea. "It isn't", replied Nigel "the champagne cork is for you".
RIP