If you click here, that will link you to a web-page which shows the appropriate figures. Once there, scroll down to the section that opens: "For instance the Sun sells..." and look at the following table.
Those are the figures for 2001. try www.abc.org.uk
ABC is what newspaper circulation is rated by (or vfd if the paper is free)
This site will also define the UK - ie did you mean to include northern Ireland?