National newspapers in the UK were traditionally divided by format, between the relatively respectable, rigourous, and intelligent broadsheets and the scurrilous, gossip- and crime-obsessed tabloids. The latter are generally subdivided into the 'mid-market' tabloids and, at the lower end, those known colloquially as the 'red-tops' after their red-background title logos. Several of the broadsheet newspapers have now adopted tabloid or 'Berliner' physical formats, but the divide in reputation between the two types remains. This is all related (as everything in Britain) to class distinctions, although it was never super-strong, with the broadsheets being linked to the upper and upper-middle classes, the mid-markets to the middle-middle and to some degree lower-middle, and the red-tops catering to the lower-middle and working classes. (The underclasses' only exposure to newsprint would have been in a chip shop.)
The UK press is collectively known as "Fleet Street", although most of them have now left that particular London locale in favour of Canary Wharf. Circulation figures correct as of January 2013