My complaint begins with your earlier post
Deaf children have support and sign language translaters in schools when they need it. Some mange with hearing aids, some don't. All get support and monitoring.
Signing is common in main stream school, I learnt some subject specific vocab when I realised the signers in my sixth form classes didn't understand the science well enough to sign it.
Many deaf students have two or three LSAs in one lesson, two to take turns translating in sign, one to write notes,
They are very well supported indeed.
Deaf students are no where near as isolated as children who can't speak English, as can interact with the teacher and other students in writing, and most can write very fast! so even on occasions when there has bee no translator, (strikes, etc) they can still take full part in the lesson, at secondary level, we just make sure all information is written.
And my complaint, and that others posting on here, is that your experience is not that of the rest of the country. That you are failing to see that your experience is not the norm. That you believe that what goes against your experience (of a small area of London HI units) must be propaganda, and that all deaf children are amply supported.
My post, which you have chosen to disregard, is totally relevant to this argument as a means to get you to think about the situation across the country as a whole.