Penguin (biscuit)

Penguins are milk chocolate–covered biscuit bars filled with chocolate cream. They are produced by Pladis's manufacturing division McVitie's at their Stockport factory.
History.
In Glasgow William Macdonald had founded Macdonald Biscuits in 1928 and was inspired by some biscuits he had encountered from Antwerp to create a chocolate covered biscuit, containing a chocolate cream sandwich in the centre.
They were first produced in 1932 by William McDonald, a biscuit manufacturer in Glasgow, and became a McVitie's brand when MacDonald joined with McVitie's and Price, MacFarlane Lang & Co and Crawford to form United Biscuits in 1948. Each wrapper has a joke or "funny fact" printed on it and imaginative, often humorous designs featuring penguins that often pastiche famous works of art.
During the 1980s, the Penguin brand became known for their television advertising slogan "P...P...P...Pick up a penguin!” 
In October 1996, Penguins were the subject of a court case between Asda and United Biscuits, who accused Asda of passing off their own brand "Puffin" biscuits as part of the Penguin brand. In March 1997, the court found in favour of United Biscuits regarding passing off, but found that Asda had not infringed the Penguin trademark.
United Biscuits had been criticised for continuing to use trans fatty acids in the cream filling of Penguins. By December 2007, United Biscuits began to advertise the absence of trans fats from Penguins, having removed the ingredient from this product line.
The Tim Tam produced by Arnott's in Australia was based on the Penguin. Occasional media references include tongue in cheek debates over which is the superior biscuit.
Types.
There are four variations of the biscuit:
Spin off brands.
In June 2003, McVitie's produced several "sub brands" or variations of the Penguin biscuit: Penguin Chukkas, Wing Dings, Flipper Dipper, Splatz and Mini Splatz. These variations were accompanied by a £5 million promotional campaign. In January 2008, McVitie's also produced Penguin triple chocolate wafers.