My nephew was 2 in June and cannot speak a word.
It is something that his mum and grandparents are very defensive about and they have been telling us and the HV that he has a vocabulary of 10 - 20 words.
My DP saw him the other day though and he cannot say anything, he can just make a 'shhh' sound and his mum admits he never says anything else. She says it is normal for boys and he will talk in his own time.
However, nobody speaks to the poor boy. He lives with his grandparents and mother (she is very young) and is encouraged to play by himself, if he demands attention he is put in his high chair with a bottle or is put to bed until he is 'good'. He has no interaction with other children and will not hold eye contact at all when you speak to him.
How can we help him? Does he even need any help? I have no idea if this is normal for boys or not as I have a daughter who started speaking at 10 months. I just feel so sorry for the kid as he can't communicate his needs.