Couldn't agree more with the comments above. I would only add sheers; they add lovely filtered light and keep the room looking clean. The full scale of the sheers also adds a sense of luxury. I've included a photo of a master bedroom where there were different size windows and even doors to a verandah. Unfortunately the photo doesn't show the entire wall but hopefully you get the idea. All have block out blinds behind them too. And another bonus; sheers are not as expensive as most other window treatments.

I hang mirrors professionally and think that jmm1837's reply is spot on. For a client of mine I would hold it up and make a decision in situ when the client thinks it 'looks right'. That said. I would probably start by recommending a position where the base of the mirror is close to being in line with the top of the bell jar. You want it to be high enough to not make the mantle top ornaments look cluttered. But you may also want it low enough to reflect a tall flower arrangement. Hope this helps.

Yes also look at 'swag' pendants. I have a table I am not sure whether we will be using in an extension. We therefore require a lighting method that is more flexible - in case table position changes with a different shape table. So far this is the only idea I have. Maybe install different railings as above to relocate the swag pendants and adjust height according to need? (We will have exposed beams I will probably use to hang light cords from).

Hi David What you could do is pull up the carpet and screed the floor with ardit floor leveller to create a gentle and barely noticeable gradient over the doorway and into the room. This is done all the time and would simply be a matter of talking to your local carpet shop about undoing the carpet (assuming your timber installer isn't a carpet shop), laying the screed and relaying the doorways. You only need a carpet layer although it is usually done over two days to allow the floor leveller to dry. The other way is that flooring distributors supply mdf ramps that are designed for ezactly these situations and again, it is just matter of getting a carpet layer to pull up the doorway, install the ramp and relay the doorway carpet. This is a same day solution although as the ramps are only doorway deep it is slightly more noticeable. Cheers