Joli, Looks like me and you have the same luck regarding nannies.
Cj also stays at home with nanny sice 6 months, he is now 18 months. I will however be sending him to creche when he turns two, only for half day.
I did send my nanny on a course that is presented by Edubabe, they train them on feeding, stimulation, bathing, dressing and grade 1 firts aid. The course was R 1200.00, and it is so worth it!
Cj is a very happy child, and gets time to interact with other children as we have a lot of friends with toddlers slightly older and the same age as CJ, and I agree with Joli that children only really play with each other from age 2, before that it is parralel play where they play next to each other but not really together.
CJ has also only been on atibiotics three times in his life (18 months).
If I should have a baby now I would definetely go the same route and leave baby with nanny for first two years, I have never regretted my desicion.