Lexicon is still a bit grey for us. Keep meaning to look at a Whisper White! Thanks

There is a Dulux colour called Polar white.

Dulux Natural White will not throw blue and will work in most situations. If you want something a bit warmer Antique White USA is a great go-to warm white. Vivid White is too stark for most home owners. Lexicon is white with black, so will be in the blue spectrum. White on white is the only Dulux white with blue in it. Whisper white can appear blue/green too.

Hi CP - our go-to whites are Vivid White (Brighter), Lexicon in 1/4, or Wairakei in 1/4. I suggest going down to Bunnings and buying sample pots (around $7-$8 each) of these plus maybe Antique White USA in 1/4 as well. Note the '1/4' strength is very important!! But if you are unsure buy it also in 1/2 or full-strength to compare. Have your painter paint a patch mid-height and slightly higher. I have a firm rule to ALWAYS finalise paint selection with sample patches prior to painting the whole wall. It really does seem that you can't decide unless you see the colour in its final environment, and your site sounds beautiful, and will have a specific impact on the perception of colour. Good Luck!

Thanks @mcmahonandnerlich for your considered response! Yours is about the only positive feedback I've had for Vivid White!! I love the cleanness of the test areas we've done but am a bit nervous that we might find it too clinical. Also a bit concerned our bedroom may dazzle our socks off as it will get afternoon sun in winter! Can you allay my fears?! And are you at all familiar with Snowy Mountains Quarter? It has a smidge of black and ochre in it, so is a tad warmer but not as warm as Natural White. Finally, do I need to be worried about the impact of our charcoal polished concrete and charcoal carpet on the final paint choice? If the paint has any black in it will the dark floors bring it out in the paint? Sorry to bombard you but your comments were so apt ... Thanks in advance!

Thank you @philippawright - yes, we've done the whole test pot thing, painted 2 coats on pieces of cardboard as well as test patches on walls etc etc. It's just not knowing how the colour will react in large areas - even Dulux couldn't tell me how particular colours would react in particular circumstances!

Wouldn't be using LED lighting would you? LED sources even in warmer tones tend to bias blue in the lighting spectrum.

Thanks @crosenburg and @johnhenson. Only natural light as yet - no power! But a good tip re LED potentially throwing blue, thanks.