My DS is 2.8 and I think that his speech is behind. I am a SAHM and he does not yet attend nursery or preschool (he will be going 3 mornings a week when he is 3 in a few months). Therefore, he isn't really in a setting with professionals and children of the same age and it is hard for me to judge.
When my DD was born (8 months ago) and the HV came round to see her, she was not pleased with my DS's speech (he was 2.0). She didn't like his pronounciation or his level of vocabulary. She didn't suggest doing anything about it and only saw him once. I didn't think much of it because he was so young and I just wanted to let him develop at his own pace. I do see similar aged children at softplays etc and usually I find that their speech is better than DS's.
Anyway, I have moved away from my NCT group so I don't really know how they are doing that specifically with their speech.
Is there anything I can read/do in order to find out if I need to get him some help (and find out who/what that help might be)?