Tank was educated at a girls' state comprehensive school, Regents Park Community College, in Southampton, Hampshire, followed by Taunton's College (also in Southampton), and the University of Oxford, where she studied Philosophy, Politics, and Economics, and from which she graduated in 1997.
Life and career
Tank was first posted to New York in 1999 and reported from the Nasdaq and the New York Stock Exchange while working for Reuters Television. She returned to London to report on the EU markets and continued on presenting business news bulletins between London and New York. From 2002 to 2003, she presented the Six Forum, the interactive forum of the BBC Six O'Clock News. In 2004, Tank returned to New York but returned to London a few months later. She currently presents business news for CNN in Hong Kong. In 2007 Tank was awarded the Summerson Goodacre & Daily Telegraph Wealth Management Award for Best Industry Commentator. 
She is a committee member of Asians In Media current affairs magazine.