you beat me to it violist.
quoting from that link >
http://www.tea.co.uk/index.php?pgId=56
(United Kingdom Tea Council)
High Tea
For the working and farming communities, afternoon tea became high tea. As the main meal of the day, high tea was a cross between the delicate afternoon meal enjoyed in the ladies' drawing rooms and the dinner enjoyed in houses of the gentry at seven or eight in the evening. With the meats, bread and cakes served at high tea, hot tea was taken.