Was talking to an girl I know who is a SALT in an ICAN nursery centre in Ealing, who says that they have quite a few spaces for children with severe speech disorders (see link below - I think this must be the right place)
My child has verbal dyspraxia and I struggled hugely to find the right program for him and ended up doing everything privately and being put on a year and half waiting list for local speech therapy services. Here is a FREE nursery with a really lovely speech therapist trained in Nuffield program where they don't have enough kids for the centre.
It seemed crazy to me and a complete shame - so I thought I'd mention it here in case anyone thought it might be great for their child who has a significant speech need. I don't know all the details, but can get back in touch with the SALT if anyone wants me to, or you can probably contact the nursery directly. Maybe there is some reason that they don't have many kids there, but it sounded like they are waiting for kids with significant speech needs to help.
I think the centre may also intergrate with mainstream kids without speech needs as well, which also sounded interesting.
Hope this may help someone.
www.ican.org.uk/early%20talk/early%20talk%20in%20practice/early%20years%20centres.aspx