The room itself is galley style with the Outside door at one end and and the Internal door at the other end. Both doors open inwards to the room. The internal door is hung on the left and the external door on the right (vice versa if I'm looking from the opposite direction). Anyway, I have found the answer to my question, which is - that it doesn't matter. I appreciate everyone's comments. Cheers

Great ideas - love the play pen concept, ha! Good point about finding another location to iron but I’ve asked for the washer/dryer cavity to be moved inwards by 120-150mm so I do have a spot I can slide the ironing board into instead of taking up space where a broom might otherwise live in a broom closet. I’m keeping the stacked arrangement bc a) I have a condenser dryer that can’t be wall mounted anyway so the stack arrangement currently works fine and b) I too wish to use baskets under benchtop for storage. I can’t see much use for cupboards the way I use my laundry and I like that I won’t have to bend for one more appliance (if only it could be the washer since I use it more!) I’ll have to deal with the washer door opening the wrong way for a while but she’s a teenager - at least 14 years, we reckon - so how much longer can she last? I’ve since researched the doors on my brand and they have all changed to the RHS opening now. So it’s a good thing I didn’t locate the machines next to the door! That would have been awkward. My dryer door can be rehung to suit any side for opening. The more I think about it, the more a centrally located sink makes sense to me in a small space and I’m happy to have come to this positioning. It’s arguably the only ‘appliance’ you’d need to stand right in front of while using, and therefore be standing comfortably in the middle of the room, not off to one side. I’ve realised that when loading a machine, you have to stand to one side. And similarly if you’re either opening a lower cabinet or pulling out a basket from under a bench. So putting either of those items bang smack in the middle of a galley arrangement means you’re cutting off your space while using it. Thanks for your input. Appreciate it!

Sliding doors allow for more robust insect/security screens

It's a laundry and as such, you won't spend hours in it, so it needs to be practical without breaking the bank. Ditch the idea of herringbone tiles. Whilst it's lovely it will cost a lot more - as it's very time consuming and more wastage of tiles too. White is very safe but it's boring and blah if you don't add some wow factor. Daphnemaria has got it just right with her picture. Your laundry would benefit from a dark floor and splash back as this will anchor the room. Then, to give that POP to the room, all you really need to do, is push the boat out and spend up large on some really funky, bright or unusual cupboard handles. Something that will make you smile. They could be bright yellow, red, one of each colour you like or some unusual shape.