I'm pleased to see a disabled character here -- not many people write about them. Also you did a good job with the interaction between a blind and a sighted person.

>>The flame moves, especially when there's a breeze, so the light and shadows change regularly.<<

It would be better to say "constantly" or something like that, since the change is often but not regular.

>>“Zander is stood on the other side of the square<<

Delete "is" above.

>>You would have been a very different person of you'd chosen to stay at home<<

That should say "if" above.

I think this is my favorite episode of the advent story so far.