Spotty
The CAA as far as I know have never pulled the bond on an operator that has had the full backing of it's Banks. The CAA is a private company at the end of the day and if it pulled a bond from a company that was supported by it's banks they would soon find themselves on the wrong end a law suit.
You are correct almost none of the UK operators meet the bond requirements, which proves the point. Had the banks not been fully behind MYT then the CAA would have acted.