Dick Eastman in his online newsletter recently had a post about the accessibility online of many 1800-1900 British newspapers (for a fee, of course). The post is a rather long one and even has a couple helpful comments posted by readers. Of particular interest in the post is the complete list of newspapers offered.
If you are doing research going back to England, the site may be of interest to you. You can see Dick's entire post at: http://blog.eogn.com/eastmans_online_genealogy/2009/05/british-newspapers-18001900-online.html