The Wall's factory making 34 million Viennettas a year
The famous ice cream dessert Viennetta is celebrating its 40th birthday this month.
Wall's, which also created the Cornetto, Twister and Magnum ice creams, made the Viennetta as a one-off Christmas product in 1982.
It is still as popular as ever with the British public 40 years on - with this Gloucester factory able to produce 34 million of them every year.
Video Journalist: Dan Ayers