I read the tax guidance myself at hmrc.gov.uk a day or two after it was published.
But today when I searched on Google for "hmrc bitcoin tax", the link to the page was showing up on top of Google search results along with description as usual, but when I click the link, it lead to a 404 Error page.
I then tried to visit the link through the following BBC article and found the same issue:
http://www.bbc.com/news/business-26426550 Am I missing something?