Possible Clues:

• Drunk a lot on a mild sherry
• Pale medium-dry sherry
• At Boxing Day party: earlier sick on a sherry
• Moan – all do it when off drink
• Wine quantity not uniform? Bad business
• A medium-dry sherry
• Sherry which is darker than fino but lighter than oloroso
• Drink drivers taking short month off work
• A drink to have a day, up to the time of a party
• Drink a day before agitation