It's insane and it's not just in nursing. I remember being constantly irritated when I lived in wandsworth - supermarket tellers were, on average, more often black than any other race. And yet, management.... all white. Every. Single. Time.
My midwife when DD was born was from Ghana, lived in the UK for 20 years and spent 3 months a year training midwives back in her home country. She was temporary staff at my hospital.
She was convinced there ws something wrong. Pressed red button. Everyone came in. After a while, decided there wasn't. She wasn't having any of it and pressed the red button again. This time a doctor came too and examined me. DD was born by emergency c section a frighteningly short time after - with the doctor telling everyone to hurry up every minute or two. She was the only nurse/midwife I saw over my entire time in that hospital (I was there for 4 days) who wasn't white. And she saved my baby - but she had to fight to do it.