I've just been reading an article on the BBC regarding this, and concerns were raised by a consultant regarding Letby and the deaths.

A meeting was requested with hospital management and it took months, MONTHS, for it to take place. If babies are dying and a concern is raised about someone administering their care how could that not possibly be the most important thing to look at? The meeting should have taken place the same day at was requested.

It's absolutely baffling and to be honest outrageous that is what happened. Those responsible for not following up correctly should lose their jobs at the very least.