I haven't seen the programme but there are a couple of comments here that I completely disagree with.
Someone said something about girls of 18 are incapable of looking after children and they would never leave their children to someone who hasn't had any themselves. I don't think this is fair and it doens't guarantee good quality care (the vast majority of child abuse happens at home!!), besides nursery workers are supposed to have specific qualifications and training, besides on job training before actually qualifying, so I'd say most of them have much more knowledge and experience then we have ourselves when we become mothers for the first time!!!
It is down to the nursery managers to employ people who have the right qualifications, no matter what age they are.
I agree that Ofsted visits should be unplanned, my nursery had a 2week notice, and they did spruce it up a bit (in terms of putting up photographs that were not there before and a few cosmetics things). I was bemused, but I know that these was really only cosmetics, the staff there are brilliant, low turnaround, all young but you can tell they do ENJOY children. I often chat to them when I pick up dd, I think it's a good way of picking up anything strange, and I talk to other parents. Besides I've often arrived unexpected (not to check on them, it just happened)and always found a very pleasant atmosphere, it is quite obvious children are happy there and so are the staff.