I think you will find the following.
The UK Government have gone off on one because they realised the security at SSH was not anywhere near acceptable.
A process is being sorted out that is acceptable to the UK Government. This will take time. Hence hand luggage only to start with. Hold baggage once all issues surrounding it's screening and loading are sorted.
As to the David Cameron 'it was a bomb'
I believe their are two different issues being played out.
The cause of the crash and security at SSH. The first Cameron has no more idea than you and I the second he is to be applauded for.