Thank you for starting the thread Serendipity22.
I used to work in and amongst the deaf community. The primary school where I was deputy had an ERF unit (Enhanced Resource Facility) because as a state main stream school, our doors were open to totally or partially deaf children. As well as teaching, I managed the ERF unit.
A deaf teaching assistant taught me some basic signs and I tried to work my way to Level 1 BSL. However, the support in the classroom came from the teaching assistants who could sign and most of them were Level 3 BSL. Every class had deaf children so the bond between myself and these amazing TAs was very close. Every class had a 1/2 hr a week signing lesson from a teacher of the deaf and signing could be seen throughout the day, from assemblies to the classroom to the playground.
In my experience, signing helps them far more than relying on the written word. BSL has its own sentence structure that is unlike either English spoken language or written English.
There is still too much prejudice out there as to what deaf people can and can't do. I remember the delight on the children's faces at school when learning to play a wind instrument. It was also great to see and listen to Rose Ayling-Ellis, a deaf actor, on Strictly Come Dancing last year.
I'm a big fan of John Bishop and I've read there was a BSL stand up show on later after the documentary. I'll watch both tonight.