F wrote:
We have a wide rectangular opening (wide doorway, but no door) between a
dining room and kitchen.

Both ceilings are to be emulsioned and the vertical faces on the kitchen
side of the wall are to be tiled and finished with a plastic edging strip.

The dining room wall to the left and right and above the opening is to
be wallpapered but I'm not sure how to treat the underside of the actual
opening. Is it emulsioned, in which case I will have raw wallpaper edges
along the vertical/underside transition, or is it papered? Or is there a
third way?


I guess the third way would be to have architrave on the dining room
side, and possibly a wood lining on the inside of the opening. You
really don't want unprotected edges round a doorway