What Bedhog said.
We checked out several around our way. The one we went for is a 15 minute drive, and offers care from 7.30am -6pm. Children staying beyond 6pm are accommodated, but there is an additional charge because the nursery also run an after-school club, so staff who would be dealing with those children are used to look after the 'late collectees'.
They cater for all dietary requirements, and tend to group the children together by age AND ability. So younger children who are on a higher/faster developmental curve get to interact with slightly older children. At the end of the day, the children are all in one or two rooms, so they get to meet other children from other 'classes' (as in babies mix with toddlers).
They have a high staff to child ratio. Despite the recommended change (recent Govt. guidelines) they still have fewer children to each staff member.
They do a huge amount of activities. If the weather is good, then children are outdoors for the majority of the day, actively playing - climbing, running, riding bikes/scooters, playing with sand/water, etc.
Learning is made part of the fun process. They're learning their alphabet and counting, practicing co-ordination, shape recognition, colours, puzzle-solving, etc. on a daily basis.
The staff are wonderful!
It's a bit expensive on the face of it (about £40 per day), but when you consider that is potentially a 10.5h day, and includes meals, I don't think it is at al unreasonable.
Sameb, maybe you could consider also posting in MN local for your area to see if anyone has any recommended nurseries/childminders?