Historically it would seem that even secretaries of state don't view the law as being particularly important. Just look at Philip Hammond as foreign secretary and his lack of knowledge over what he was actually signing when it came to warrants.
As always I would recommend getting in touch with your MP to tell them what you think of this, particularly since MPs themselves are routinely being stripped of their own privacy when it comes to emails.
WriteToThem.com has always been useful for this in the past.
Biting the hand that feeds IT
