Vast database that provides access to over 20,000 news sources from all over the world. Particularly excellent for UK, North American and much of Europe. Its coverage is largely current and recent, but does go back 20 years in some cases. For UK newspapers, generally covers broadsheets from 1980s and tabloids and local/ regional newspapers from more recently. Also include BBC Monitoring Service.
Much overlap with Factiva. If you can't find a newspaper in Nexis UK, then try also Factiva.