The basic composition of a sausage roll is generally a sheet or sheets of puff pastry formed into tubes around sausage meat and glazed with egg or milk before being baked. They can be served either hot or cold. Historically, during the 18th century they were made using shortcrust pastry instead of puff pastry.
The Blackadder series makes mention of sausage rolls. In the first series, episode Born to be King, the Queen is loathing the return of her husband because she feels as she's "being used all night long, like the outside of a sausage roll." In the second series, episode Potato, being overly excited from the return of Sir Walter Raleigh lends the Queen excuse to describe some of her "pretty wild dreams," one of which is her being a sausage roll.
In New Zealand, the sausage roll is so popular that a 'Hot Sausage Roll Club' was set up by staff at the Hawke's Bay Regional Council. The club holds bi weekly meetings where both store bought and home made sausage rolls are prepared and eaten by the group. After 7 years of existence, other chapters of the club have been started at the Southland Regional Council and the Hawke's Bay District Health Board.