What is the difference between "News" and "News Databases?" New Databases provide you all the content available from a publisher whereas simple news sites allows access to only a certain number of articles before asking you to pay.
LexisNexis Academic is one of the best resources for current Foreign press and has items available in many languages.
Specific titles that will provide unique insight into the Brexit include
The Economist (LexisNexis Academic)
Financial Times (Access World News)
Times of London (Access World News)
These databases provide access to historical news stories that will give breadth and depth to research regarding the creation of the EU as well as leading to the UK's exit.