Would an Admiral who said "No, we cannot do it" be listened to? Or would No 10's inner circle over rule him? I'm not convinced that the safety and welfare of members of HM Forces is seen as important.
WEBF
Sadly, there is enough evidence around from over the years to make that a perfectly reasonable comment. I hope you are wrong, but would not put much money on it.
It is only too easy to loose sight of the simple fact that governments pay and design their armed forces. This means it is impossible to avoid a conflict of interest between any government and its MOD. It takes strong and good men on both sides if the system is to work even well, let alone perfectly.