A tea lady is a woman in an office or working environment, whose sole job is to provide beverages (chiefly traditionally tea, but other beverages including coffee and hot chocolate, now more common) and light snacks during the allocated tea break. Tea ladies are a mainly British custom. They entered the mainstream in the UK during the Second World War, when tea ladies were used in an experiment to boost efficiency in workplaces for the war effort. They had such a hugely positive effect on morale they became commonplace in all areas of work, mobile canteens even serving military units on exercises. They were present in a works canteen or perhaps came round with a trolley, on which was usually a tea urn full of either hot tea or hot water, and perhaps a selection of cakes and buns.
In the past they were often used as stereotypical figures in British comedy, with a tea lady usually portrayed as a harassed, overweight, middle aged woman in a uniform and cap, or as a very pretty recipient of all sorts of lewd comments from the workforce, as in the film Carry On at Your Convenience.
The character Mrs Doyle in the 1990s sitcom Father Ted, set in Ireland, had the role of a tea lady, and became known for relentlessly forcing the other characters to drink the tea she'd made for them, possibly a reference to the fact that the Irish are the biggest tea drinkers in the world averaging 4 to 6 cups per person per day.
Tea ladies in general were a frequent target of illusory "cuts" and "economies" in Yes Minister, frequently conjured up by Nigel Hawthorne's character Sir Humphrey Appleby, but a tea lady was only once seen onscreen during the whole five-series run of the show, sharing a lift with Jim Hacker and Sir Humphrey Appleby in the episode "The Skeleton in the Cupboard".