I've completed it.
I was a bit surprised at the inclusion of a section on transgender people as there has never to my knowledge been a transgender person in The Archers. However, perhaps that's accounted for by Mumsnet's well-known status as a hotbed of gender critical people. I felt the questions on that section were not phrased in such a way that I could get my own views across. I don't hate transgender people, far from it, but I don't accept that anyone can change sex (not gender, as that's a concept I don't accept) and to the extent that anyone believes moving from one set of gender stereotypes to another means they've changed sex I disagree very strongly. I also didn't like the wording of the question that asked if I believed that genitalia determine a person's sex. I don't, chromosomes do that in almost all cases, and the form of the genitalia are usually determined genetically. I said yes though, as the nearest option to what I do believe.
I also felt that some of the other questions lacked nuance, as I often find on questionnaires. You ask whether we find certain characters likeable. I have favourite characters, e.g. Brian Aldridge or Lynda Snell, but I don't like them as people, I just enjoy listening to them and their interactions with other people because they're strong characters, behave outrageously, are given good memorable lines etc etc. So I wasn't sure what to answer to that.
Also, time marches on and unfortunately your question about where Brian lives is about to be out of date. The perils of devising a questionnaire months ago so you could get ethical approval through last term, presumably!
Hope you get a good response.