A friend of mine is about to issue legal proceedings against Dept of Health... Cos when they send out poosticks they don't check the Visual Impairment register (which is a thing) so send out instructions blind people can't follow and don't offer alternatives. They could be sending emails offering a GP surgery nurse administered alternative.
I know how impossible it is to get a Covid test if blind and can't self-administer (watching the buck passing was painful), I can't imagine a bowel screening alternative is much better.
I expect friend will succeed, he's responsible for a fair bit of legislation that bolsters disabled people's right to access case.