By far signed access is not an issue, but the difficulty, of an interpreter, being able to keep up with the complex details in the short time allowed. As its stands with in-vision BSL access 65% of all detail is not signed, the terp hasn't the time, and the deaf audience varies far too much in comprehension, to satisfy all of them, or indeed most. Just like your usual day to day support for BSL a Terp has to adjust to the person in front of them, obviously an impossibility for someone on a TV program. So you will never satisfy all the people all the time, or even most of them.
Hence why the English access area took the option to put detail on a channel at length so deaf had that time to follow. Which in retrospect seems the best option. The issue as always isn't just when the access is there, but IF it can be followed effectively, at the time, or later in detail. As always subtitling is there and extensive.
Like most deaf (Or hearing in the UK), the problem currently is wading through the detail, and mind-boggling graphs and statistics, and here, deaf are at a complete disadvantage they haven't the ability to do it and rely on peers explaining, or, edited 'highlights' then they follow the herd view. Just like clear masks and such are no use FOR a deaf person, it needs others to wear them, even then comprehension relies on the individual's skill.
It is not as simplistic as putting up an Interpreter for the deaf, that campaign is to profile sign rather than make a point it is sufficient access, as detail requires the length of time to follow and the media doesn't give anyone that time, politicians refer them to websites etc for that. Perhaps a case for BSL websites, but there are to our knowledge already 9 dedicated charities already doing that. ATR published them 6 months ago. Which also included the same charity that published this 'survey'?
I'm pretty astounded they provide a BSL explanation themselves and get funding for that and then omitted to say so! Obviously older deaf are struggling as many are not online and a number struggling to read titles etc, but we could suggest even signed detail is not going to go a long way in sorting those issues out as they are lifelong ones.