If visitors to Google, the popular search engine, type in the word ‘liar’ they get Tony Blair's official biography among the top results, a reference to claims the Labour leader misled the public over intelligence on Iraq.

Evidence of anti-Blair campaigns is all over the web, says Tim Ireland of Bloggerheads, who created one of the most widely-read politicians' blogs for Conservative MP Boris Johnson, and produced the first MP's blog, for Tom Watson, the Labour member for West Bromwich.