I had my test last week and although the person setting up my test was very kind the experience could have been much better. I am writing this for anyone else who is waiting to have this appointment. If you are worried or nervous check out where you can go and have a look first.
Specsavers was inside Sainsburys the machine was tucked in a corner but open to the public, it was very noisy. I failed the first test, because the lady told me there would be a demonstration first but failed to tell me it was part of the test.
You are allowed three attempts, I did expect the machine to be the same as the hospital but it was different, not a fixed red dot but a moving one.
I also had to see the optometrist for a sight test which was in a what I ca only describe as a cupboard probably why she wore a mask.
My test was successful subject to a DVLA decision.
Hope this helps somebody out there.