Other resources
The BBC provides a wide variety of tips and methods including those featured in 'Who Do You Think You Are?'' which helps celebrities trace their ancestors.
The Westminster City Archives are especially useful if you have ancestors from Westminster, Marylebone or Paddington.
You can also find other helpful sites on Gateway to Websites.
You may have famous ancestors or they may have been mentioned, paid for an advert or sent a letter to newspapers, so check The Times digital archive and Oxford Dictionary of National Biography.