Oprah Winfrey is launching a Starbucks tea

In the evening menu put forward by Starbucks, wine and beer options are available beyond 4pm. There are also a host of food options to add to the standard offering of danish pastries and muffins, including artichoke and goat's cheese flat bread and toasted walnut bread with fig preserves.

It's thought that the move to diversify and create greater revenue has been sparked by a rise in wholesale milk and coffee prices.

Starbucks is also targeting the tea market, with a celebrity-endorsed tea from Oprah Winfrey - the Oprah Chai Tea. All proceeds from sales will go to education charities such as the Oprah Winfrey Leadership Academy for Girls.

The store has more than 20,100 branches worldwide, with 11,500 in the US.

Photos: Rex Features

Starbucks to turn wine bar with alcohol and deli dishes