Firstly...are you sure they are jarrah and not som other more exotic timber? If you are fortunate enough to have a genuine 1932 built cottage I say "Don't Do it!" Just look at the beautiful timber in that floor! It would be sinful to paint it. I have a 1924 cottage with beautiful hoop pine floorboards all from the day it was built. My suggestion is to have the boards sanded and polished. I would not even dare go near them with polyurethane. I have turned back the clock and used the methods of the period of the house...a mix of pale boiled linseed oil and kero. Put it on with a mop or a deck mop or a wool mop leave it soak in. Re-do and leave it soak in,,,( you won't get patches...the floors will just soak it up.) Third coat, add a bit of turps to the mix as a white ant deterrent. Then, when the floors look like they've soaked up enough, get a big old fashioned string mop...if you can find one...or use a deck scrubber and old towels...or even a wad of new ones...100% cotton...its worth it, and rub off as much of the surplus as possible...wear sox so you will notice when the sox do not get oil stained anymore. First go is a long process but you will be really pleased when the floors have had several "drinks". After that you could get just an ordinary floor varnish or oil or just a sealant. Some of the modern wood treatments are really good. Then, every so often do the boards over with your "Oil Mop". You will never find timber like that again and, in my experience, it adds to the value of the house big time. Do what you like to any gyprock and plastered walls but PLEASE love your floorboards and any natural timber...especially from that era. I've been in this old cottage for 32 years. Everyone wants to know where I sourced the "new" floorboards", and who did I get to make my silky oak windows! Hope that helps.

Definitely don’t change direction to turn a corner. That’s a big no. Keep it all the same direction, it will flow beautiful

Nice floors! I am a big fan of Dulux Natural White which would be similar to your reference pic.

Maybe its just me , but this is made worse by having the buttery yellow walls -- in fact , the darker brown , the yellow and the white just screams 1970's and/or bumblebees . The ptroblem is that the brown is still too dark even if you went all white , but it would be an improvement IMO , and relatively inexpensive . I'm trying to think of something better , and to me , a wallpaper that is mostly white with a gold scroll or something modern like gold stripes would look good -- just keep away from anything that looks 70's unless the retro look is what you are wanting . Oh , and maybe add an artwork halfway up the stairs on the 'right' side -- art always looks good if appropriately chosen , plus it will distract the eyes .