That service doesn't seem the most liklely to have a First Class host, although it could do. Perhaps someone who has access to the XC Intranet can check for you? If nobody can look it up you could try tweeting them, they will probably tell you. If your train has a First Class host and a Retail Service Manager (whose job it is usually to sell refreshments in standard class) you will generally receive the complimentary menu as at the link provided. The Menu is provided as shown on the map there on weekdays only 0600-2000.
If there is a staff shortage or your train is not diagrammed with a First Class host, the Retail Service Manager will serve you drinks and snacks when they can, between going through Standard Class. If there are no catering staff on the train, the Train Manager may be able to serve you when they have completed all of their other duties, but this is only likely to be a drink and snacks and they may not offer you anything at all. I have never been served the full menu, usually down to a staff shortage for my rare weekday travels. The things I've been served by the RSMs at the weekend or during other times of staff shortage are nice enough, cups of tea coffee or hot chocolate, coke or diet coke, still or sparkling water or fruit juice. Packets of cake, biscuits and crisps were the main snacks. I once used the 1107 from Manchester Piccadilly but the menu wasn't available. The Train Manager told me that most of the services in the middle of the day weren't even booked for a First Class host!
