The Convention on the Rights of Persons with Disabilities is an extremely important and powerful piece of European legislation, which the UK has signed up to but which we appear to be determined to ignore.
The full text of the Convention is here. The Articles clearly referring to sign language are Articles 2, 9, 21, 24, and 30.
It is a legally binding document that defines sign language as a right, and also highlights the need for the eradication of physical, social, financial, political and attitudinal barriers.
There is a protocol, all of which the UK has signed up to.
The flaw, as always, is that it is a legal document that protects oppressed and voiceless people from being kept oppressed and voiceless, but only if those oppressed and voiceless people know about it and have the energy and resources to take their local authority, school, or hospital trust to court in a likely escalating series of hearings.
So the other thing the Deaf Community could do with is legal representation from somebody willing to take such a case on. Do you know of such a person?