The top agents in MI6 are Angels - there's nothing angelic about them, but they sure are dangerous. And not always good with taking orders from bespectacled, stringy Quartermasters.
MI6 has decided that a new strategy is needed to ensure the success of their missions, and for that, they hired Q: with his genius mind and [mostly] cool head, it became his job to coordinate the 00-missions.
Now the double-o's have a voice in their ear telling them what to do, where to go on missions.
Do the double-o's take well to this?
No. And the worst ones are 006, 7, and 8...

In which Q's got a spine and is willing to beat double-o's over the head with it.