I was first looking at those with obvious interrest in getting rid of Blair. France because Blair's opposition to France's anti-American efforts in the EU, Saddam people for obvious reasons, the Clintonistas because of Blair's working with Bush and in order to cover anything the sinkmaster was up to, the leftists of the BBC to hide the government's finding out that they make up news for subversive reasons, and the leftists in Blair's own government who want him gone.
If you can suggest a reasonable theory for the Mossad being involved I will be happy to consider them.