UK Newspaper Guide
Traditionally, UK newspapers could be split into more serious-minded newspapers, usually referred to as the broadsheets due to their large size, and sometimes known collectively as "the quality press", and less serious newspapers, generally known as tabloids, and collectively as "the popular press", which have tended to focus more on celebrity coverage and human interest stories rather than political reporting or overseas news. The tabloids in turn have been divided into the more sensationalist mass market titles, or "red tops", and the middle-market papers.
However, both The Independent and The Times have switched in recent years to a compact format, not much bigger than that used by the tabloids. The Guardian switched in September 2005 to what is described as a "Berliner" format, just slightly larger than a compact. Its Sunday stablemate The Observer has since followed suit. Other Sunday broadsheets, including The Sunday Times, which tend to have a large amount of supplementary sections, have kept their larger sizes.
http://www.thepaperboy.com/uk/uk-newspaper-guide.cfm 
