As far as I am aware NOBODY has stated that it was definately a bomb and the only people who have stated that it wasnt a bomb are the Egyptians.
UK are saying there is a high likelihood that it was a bomb and are therefore doing what one would expect a Government to do to ensure the safety of it's citizens.
The Russians are not saying a lot but appear to be awaiting more investigative results.
All the political conjecture and conspiracy theories are just that.
Having said that, I am a little surprised that the CVR is allegedly badly damaged and cant be interpreted yet, having seen the photographs earlier that showed it in pretty good condition. Could it be that it HAS been listened to and that release of the content is being delayed for whatever reason?