There's just two things wrong with your post. First, you can't pass a law saying "this law can't be repealed" - it's unconstitutional (and, as others have noted, a terrible idea - sure it's great to "lock in freedom", but what's to stop them "locking in tyranny" through the same mechanism?). You would have to do it through a constitutional amendment which is much harder to get though (and even that can, in turn, be changed by a later amendment).
Second, there's nothing "rogue" about this minister. He has the full support of the Prime Minister in his actions.
There's just two things wrong with your post. First, you can't pass a law saying "this law can't be repealed" - it's unconstitutional (and, as others have noted, a terrible idea - sure it's great to "lock in freedom", but what's to stop them "locking in tyranny" through the same mechanism?). You would have to do it through a constitutional amendment which is much harder to get though (and even that can, in turn, be changed by a later amendment).
Second, there's nothing "rogue" about this minister. He has the full support of the Prime Minister in his actions.