Haven't read the whole thread, so apologies if this has been covered.
Over the past 15 years I have worked in roughly 20 day nurseries (did supply nursery nurse work for a couple of years at one point)
I have never worked anywhere that I would be happy to leave my dc for long days.
My ds1 went to nursery for a couple for mornings a week when he was 18 months onwards though. Studies showing the detrimental affect of nurseries usually base their research on children being there full time.
I also dispute that Ofsted will give you a good idea of what the setting is like. As others have said, the nursery can be scruffy with wonderful care, or beautiful with not great care. My dd goes to a preschool now that has no outside space at all, so does terribly on Ofsted reports.
But she is only there for 2 1/2 hours a few times a week, and she spends a lot of time out in the garden at home.
You have to do what is right for you and your family as a whole, but please don't think that if you are paying through the nose for child care that it is necessarily any better than other care.
Each to their own, but there are many options I would investigate before I would even consider a full time place at nursery.