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United Kingdom

Season 1-7 are available on DVD in the UK and Ireland. Part 1 of season 8 is available with the second part of season 8 coming out on February 16th of 2009.

United States

Season 1-8 are availble on DVD in the US and Canada.

Australia

Season 1-7 are available on DVD now.

Blu-Ray Disc Releases

Season One will be released on May 12, 2009 on the high definition format, most probably in the US first.