William Hill published its first political betting advertisement in 1964. 50 years later, a William Hill customer made betting history on the back of a record political bet.
On 7 February 1974, William Hill's Barbara Elson chalked up the betting odds on majorities in that year's general election. She was following a tradition that dates back centuries.
Are betting markets more reliable than polls at predicting the outcome of a national vote? Have a look at the latest odds and decide for yourself.