I think that you've asked the wrong question! I can see little point in referencing that link, per se, since it doesn't directly provide any information . All that your link does is to provide a further link, to the publication 'Clinical Governance and Adult Safeguarding'. That's actually (in its original form) a printed document, which just happens to have been provided as a PDF file for the convenience of web users. However your source remains that original document, not the web page you've linked to.
So the document could be referenced as follows:
Anna Morgan, Editor (2010) Clinical Governance and Adult Safeguarding - An Integrated Process. Department of Health.
(In that reference, the publication's title should be underlined, or in italics or bold type, depending upon the style that you're using for other references).
If you really do need to reference the actual link, this should suffice:
Department of Health (11 February 2010) 'Clinical governance and adult safeguarding: an integrated process' [online]. Available from
http://tinyurl.com/y8mbc2d [accessed 7 March 2011]
Don't worry too much about getting Harvard referencing exactly right. As long as the person reading your work can see what your sources are, minor irregularities are completely irrelevant anyway.
Chris