I actually know that one.
Uncomfortable seats, bright white light, empty walls.
It's done on purpose, to discourage people from spending more time in A&E than is absolutely necessary.
I am seruous, BTW. People go to A&E for all sorts of reasons... including to sleep there (security will move them on). Some just like hospitals. Others use it instead of making a GP appointment. Etc.
The design is such that the place is functional but uninviting.
Chris, you waited 5 years for this answer...
do now you know