Well if you win the 2009 Championship on the basis of it you might get told off.

it's illegal under Section 18 of the Computer Misuse Act c.1990, Clause 1.
http://www.opsi.gov.uk/acts/acts1990/ukpga_19900018_en_1#pb1-l1g1
if you manage to recover some data, purely for the sake of your own personal curiosity, i'd recommend you don't tell anyone, don't spread the data to other computers or storage mediums and delete it when your curiosity has been sated.