bunnyhops
I have a ds (now 5) with a speech and language disorder. He went into the School Nursery (half-days) at just 3 and only had single words, not many of them - and the ones he did have were difficult to understand. He was potty-trained though.
He has been working with an excellent SLT for two years and has made very good progress. He now speaks in sentences and most people can understand pretty much all that he says.
I just wanted to post a message of encouragement for you really. I never thought my son would be as intelligible as he is today but hard work and staying positive have paid off. I too have wondered if I didn't talk to him enough when he was a baby or something - but don't go down that road, there's no point - and if you weren't a great mum you wouldn't be so concerned about him or on here trying to find ways to help him.
I once met a mum whose son was a similar age to my son (going on 4 - about to go into Reception if I remember rightly). She told me that her son also had Speech and Language problems and that he was not yet potty-trained. They had an appointment to see a paediatrician just to check that it was purely a Speech and Language issue. Apparently sometimes other things can be involved. So maybe ask your GP/HV/SLT to refer you if feel that would help to reassure you.
I remember our SLT saying that our son's receptive language (understanding) was fine and that that was the main thing. Expressive language problems are more easily corrected, I think. So that's a big positive.
Good luck. We worked with out son for ages and made very slow progress - but after about 18 months there was a huge leap and he has covered a lot of ground in the last 6 months.
As regards the phonics, our SLT firmly believes that phonics is the only way to teach reading, and I agree with her. We used Jolly Phonics in Speech Therapy and I have used it to teach my son to read and he can read very well. His nursery teacher told me that if he couldn't produce a sound, just to say it for him, so he learns to correct sound-symbol correspondence.
There are really helpful posts on the Education thread by "Catflap" on reading and Jolly Phonics. These websites are also useful:
www.jollylearning.co.uk
www.rrf.uk.org
www.syntheticphonics.org.
It sounds like he is doing really well at school, both academically and socially, so again all that is really positive. Have you asked the school if he is entitled to any extra help because of his speech problems? And have you applied for DLA?