I am a WOHM who has used ft nursery for both my dcs from a young age. SB does not trouble me.
Truth it, he is irrelevant if, based on your individual circumstances, your dcs are clearly happy with their nursery and are flourishing, long hours or not.
SB claims to quote research and that is fine to inform public policy. I say research away, because for every study that shows a bad nursery is harmful, there will be another study which says a good nursery is beneficial. Just like a good mother brings up lovely children and a neglectful one does not. It is not rocket science.
Unlike many posters, I have personal observations of these poor children who spend long hours in nursery 10 hours a day, 5 days a week. I know because I am there at 8 am with them and their parents, waiting for the clock to strike 8 am and there around 6 pm when the doors close. I have seen these children at pick up time, at their most stressed out. I have seen them playing at each other houses on playdates and each others' birthday parties.
You know what, I don't worry that they will be aggressive and have mental health issues. They are my dd's and ds' friends. They move onto good primary schools. Often have 2 working parents, and still find the time to take them out to museums, parks and play areas on weekends. They are not perfect, a lot of them went through an aggressive phase at around 2-3, but all came out at 4 lovely and a delight to have around.
Yes, my nursery is a good one. I don't know whether it is due to the cost, but I coincidentally pay more than £1K for a ft below-2 place, around £800 for a 2+ place, dropping to around £650 after the sure start grant kicks in at 3.
I wouldn't worry about these ft children. They have the best immunity from mental health issues possible - 2 involved parents and a happy family life, with lots of stimulation and fun during the week.