Just thought I'd throw this in -
We don't have SN kids but we recently stayed at a great B&B near Truro that had wheelchair access and wheelchair accessible showers. The lady of the house used to be a SN teacher, I think.
Sorry, I can't do links but this is the website.
www.tregoninny.com/
The accomodation is great, though it's accessed up a long track which might not suit all vehicles, I suppose. We had a two bedroomed unit with two bathrooms and a small sitting room at a cost of £110 per night. The Brekkie was great too.