Hello Emma, Please don't get rid of these... You can still have a really ultra modern interior in a period setting... In fact for example Victorian and Georgian period buildings look amazing with a modern look... It all just depends on what you choose. Also you may wish to make a feature of these by choosing really bold colours to enhance these features.. .. : ))

I have the same dilema and my extension looks more or less the same as yours. I really want coving as it doesnt feel fnished without it. Im not sure whether to cove up to the apex and stop?… can I ask what you ended up doing please?

In 1930’ ceiling to wall coving was rarely used, instead a picture rail was added to the wall a short distance below the ceiling. If you follow the bottom of the slope around the rest of the wall and add picture rail (use substitute deco rail if cannot find reclaimed original) so that the picture rail is one continuous line around the room and paint a lighter shade on the ceiling and slope than on the wall below, this will give the illusion of balance. Love 1930 houses.

I haven’t done this, but I found these examples, although the second pic is mid build.