I'm having this worry with a preschool. We're looking at two in the area, and went to see the first yesterday. It's meant to be the best, the newest, my friends children go there.
During the visit, there were 3 workers in the playground (a disused tennis court) 3 people who looked like parents ?? we weren't told who they were and there was only 5 toys out. And about 25 kids. Ds (21 months) started playing and three boys started bullying him - pulling him around by his hood, throwing toys at him, grabbing him - and one person was watching them occasionally saying 'don't do that xxxxx' but doing nothing about it. We gave them the benefit of the doubt for an hour, 30 minutes was outside but we kept having to watch ds and remove him when he got agitated.
I asked a worker who monitored the children, she said each key worker was responsible for 'checking up'on their kids. Interesting, as my friends dd's key worker doesn't work the days that the dd goes to preschool
The whole thing was chaotic, and for a new preschool the lack of toys or inspiring play area was shocking. I'm hoping we move soon, as if that's the best in the area I'm worried.
Sorry went off topic! Basically, if we hadn't intervened ds would have definately been at least scratched if not injured by the end of it. I'd talk to them, and tell them they need to pull their finger out, basically, and start actually monitoring the kids.