What is the background of 5 o'clock tea tradition?

This tradition was introduced in England by Anna, the Duchess of Bedford, in 1840. The Duchess became hungry around four o'clock in the afternoon. So, she asked her servants to bring a tray of tea, bread, butter and cake to her room during the late afternoon. This became a her habit and she began inviting friends to join her. Soon, tea was served in the drawing room between four and five o'clock. It was a chance for women to exchange gossip and be introduced to new acquaintances.