Doctors were forced to apologise for raising alarm over Lucy Letby and baby deaths

Guardian investigation also reveals Countess of Chester hospital executive feared contacting police would damage reputation'

Lucy Letby's colleagues were ordered to apologise to her after repeatedly raising concerns that the nurse may have been behind a series of unexplained baby deaths, the Guardian has learned.

Senior doctors had warned for months that Letby was the only staff member present during the sudden collapses and deaths of a number of premature babies on the Countess of Chester hospital's neonatal unit.