ANTHONY ROSE delves into the changing role of the sommelier and takes a look at two new books on the subject: Thirsty Work by Matt Skinner (17.99; Mitchell Beazley) and Drinks by Vincent Gasnier (30; Dorling Kindersley). The increasingly popular Skinner steals most of the column space, with Rose commenting, 'If someone is going to get my 19-year-old son and his ilk across Jacob's Creek and beyond, Skinner has the knack.' Gasnier doesn't fair quite so well. While Skinner is 'refreshing' and 'selective', Gasnier's 'undoubted passion and knowledge are deflated by a dj vu image fest'. If you fancy splashing out this week, Rose's choice would be 2003 Cte Rtie Les Essartailles (25, down to 19.99; Majestic).