I had a full time maternity nurse with my first child for 2 weeks. Why? Because I could quite honestly. I had no family to help, was the first to have a baby out of my friends, had never handled a baby. It was the best money we could ever have spent at the time.
She was a lovely older lady who had helped out friends who had babies and started getting asked to help out with more babies. I think that she was nurse originally but she was just confident, caring and helped me through the first couple of weeks. I have no idea of her qualifications, I don't know if she had a CRB, I don't suppose she had been on any courses but I knew of at least 15 families she had worked for repeatedly. I met her and interviewed her in another families home and knew she was right.
She didn't clean but she did all my cooking, tidying, flower arranging, and she was fab.
She wasn't good with Breastfeeding though, V old fashioned which I only realised in hindsight and generally I don't think that maternity nurses are good for mothers who want to EBF and you'd be better off with a postnatal doula.
For my 2 subsequent children I had a night nurse 2 or 3 nights a week, 10-7 for 6 weeks. This actually worked better as I didn't need someone around all the time but I did need some sleep so I fed at 10, left expressed milk for the middle of the night and fed at 6. Again, I have no idea of her qualifications but knew loads of people who used her and she was also lovely.