Tuc said:
"I wonder if the Build Standard reflected in the Boeing Safety Case in the US is the same as the proposed UK one? We are told they are the same, but I'm not so sure. "
I would be absolutely gob-smacked if the Safety Case in each Directorate was even remotely the same.
The UK and US spec's should reflect those nations individual expectations and standards. The differences are clearly stated as such in the MAA's declared aspiration to align with future US mil certification processes for Apache and F-35.
They only have to bend the current rules slightly to achieve that.