Have done some hunting Kate, and haven't found much at all. I can't find any published articles written by him on two major medical literature search engines. I have found a couple of mentions of Doman therapy which say it was proposed in the 60's - does that sound right to you? Unfortunately the only article I have found so far says that his theory has been discredited.

Have you heard of Bobath therapy at all? It is a really interesting technique, very widely practiced and applied to children in particular with neurological problems.