saying yes to a place - what to do?

[sandyposy]

I live in London (W6) and my son's due to start his state-paid nursery in Jan. I applied to several nurseries, and he's been offered a place in the school that I liked least of the four. Does anyone know what the protocol is for accepting nursery places? I mean, if I accept this place, will my son automatically be taken off the lists of the other nurseries I applied to in the borough?
None of the others have got back to me yet, and of course it's half term so can't get through to anyone to ask when decisions are usually made.