babieseverywhere what behavioural difficulties does your DD have? Any issues my DD has had all seemed to right themselves as her speech progresses. She is now 2.7 and although she has made great progress is still behind her peers.
To be honest thus far I haven't had a great experience of NHS SALT, I feel they haven't done a lot other than assess her. I am grateful for this though as their assessment has reached the conclusion that she doesn't require any intervention on any other level, just speech. IMHO the best thing for her was going to nursery, this has brought her on leaps and bounds in her speech and social interaction.
In the meantime I guess you are probably doing everything you should be doing. There is a book 'it takes two to talk' which is good, but expensive, see if you can source it from a library. Most of it is common sense. Things like modelling back words to them they are trying to say, using repetition of a key word, so if DD try's to say water (currently wa-wa for us) I will say back to her 'water, you would like water, nice cold water, water to drink?'
you get the idea? The book also stressed the importance of pausing and allowing your LO to get a chance to talk. Engaging them in stuff they are interested in will encourage their speech too. But like I say you probably do a lot of this anyway 
I found the bee bright DVD's very good so have a look at those, something special was recommended to me too, but DD would not watch it, however she loves bee bright (same guy who does something special).
I made DD a scrap book of photos of family, and her favourite things, printed out the words in big bold letters, she loves that book and can now say the word for every item in it, well apart from mummy, she has trouble with M's so I'm Noggy
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If I think of anything else I'll come back to you. HTH