I've been thinking about this lately, and have wondered if there'd be any call for it or if it exists already. Basically a small nursery setting with much smaller adult:child ratios than a traditional nursery (1:1 for under 18 months, 1:2 for 18 months to 3 years, 1:4 for 3 to 5 years for example). The baby room might have 4 adults and 4 babies, and the adults move with the babies to the next room ensuring continuity of care. A set up like this would obviously have similar costs to employing a nanny, but with the advantages of not having to be an employer. There would be the one to one care of a nanny, but the benefits of a nursery in that there would be multiple adults around, socialising and structured play for the child, sickness/holiday wouldn't be a problem.
Would anyone use a setting like this? Or are the nanny and nursery markets very separate?