I love the colour you have painted the sun room wall. My advice is always to be brave and bold! I would continue this colour into the dining room as this will create continuity. Your light coloured furniture in the dining room will also look great against this colour - it's a bit lost right now against the yellow walls. Go for it :)

I had my sitting room door dipped many years ago and it was fine. I kept mine natural and just varnished it. I’m far to lazy to be bothered with stripping a door by hand! Here’s a pic

These guys have great products! Check it out below..great idea to use it in your bathroom! Will look stunning;) https://www.theenglishpanellingcompany.co.uk/cat_summary.php?cPath=0_21&osCsid=tjdokgkovp23tdng9ggrbpl5i3

I think you have used the wallpaper in the wrong place. I think there was already plenty going on with a TV, fire and niches for both and the paper would have had more impact on a flat wall.