Wispa is a brand of chocolate bar manufactured by British chocolate company Cadbury. Using aerated chocolate, the bar was launched in 1981 as a trial version in North East England, and with its success it was introduced nationally in 1983. It was seen as a competitor to Rowntree's Aero (now owned by Nestlé). In 2003, as part of a relaunch of the Cadbury Dairy Milk brand, the Wispa brand was discontinued and the product relaunched as "Dairy Milk Bubbly". As part of the relaunch, the product was reshaped as a standard moulded bar (similar to other 'Dairy Milk' products) instead of a whole-bar count-line. In 2007, helped by an Internet campaign by enthusiasts, the Wispa bar was relaunched, albeit for a "limited period". In October 2008, Wispa permanently returned to shops in the UK and Ireland due to the chocolate bar's popularity during the previous limited period release. Manufacture The tiny bubbles within the chocolate form via aerating the molten chocolate with gas, typically carbon dioxide or nitrogen, while at a high pressure, which causes microscopic gas bubbles to form within the liquid. The liquid is then lowered to atmospheric pressure as it cools, causing the gas pockets to expand and become trapped in the chocolate. Air is not used to make the bubbles as this would oxidize the chocolate. Advertising The bar was launched by teaser advertisements in 1983 bearing the phrase "Have you heard the latest Wispa?" which did not identify the product as a chocolate bar. Original Wispa advertisements, all performed to camera in front of a black background, featured well-known actors such as Paul Eddington, Nigel Hawthorne, Victoria Wood, Julie Walters, Simon Cadell, and Ruth Madoc. John Le Mesurier and Arthur Lowe also made a final appearance as their characters from Dad's Army. At the time of its comeback in 2008, Wispa was re-launched using large outdoor posters featuring the tagline "It's back. Apparently." and smaller, roadside posters featuring conversations about Wispa returning, which read; "Apparently, the Wispa thing is true. It's coming back. Finally. Brilliant." In December 2009, Wispa aired a television advert entitled "For the love of Wispa", starring members of the public recruited from an earlier advertising campaign. The advert included cheerleaders, choirs and grandparents, and was aired on 20 December at 8 pm on ITV. In 2009, to mark the return of Wispa Gold a request for submissions to be considered for