What did we learn from the Lucy Letby Inquiry?

After 59 days, 133 witnesses, and 396 statements - the Thirlwall Inquiry, looking into how Lucy Letby was able to murder babies at the Countess of Chester Hospital has heard all of its evidence - and one word was prominent - sorry. But other than apologies what else have we learnt? ITV News correspondent Mel Barham takes a look at just what is new - and what comes next.