The grey on the western wall looks dark and purplish on my monitor. It may come over as too imposing and monolithic on the southern face. If you're sticking with the grey palette then a warmer tone would suit the sandstone better. Does Dulux have a colour palette recommendation that includes your Berkshire White plus a grey? Check online or in store pamphlets. But, for such a big, expensive, and impactful paint job I would actually be tempted to get a colour consultant. You're not just repainting a loungeroom wall if it doesn't work!

Go grey as advised above, don't paint window frames if they are metal but leave alone, plant sasanqua camelias along the side boundaries (they can be hedged) to screen out neighbours & add greenery plus colour, landscape the front. Don't do white stones as they look dirty after a while and are blinding in the sun. I'd get rid of the stones altogether. If you are a gardener, put in box hedging and some standard roses (yes, I know done to death but they are charming), or draw up something on paper first - play with shapes. A garden makes a house look good.

Could you get surfmist in half? I didn’t think that was possible. I’m currently considering surfmist but wondering how it will turn out. Do you have a pic!

thanks again dreamer, I actually contacted a neighbour across from us who recently rendered his house along with his neighbour who did his in the past year. This fastidious lovely neighbour I spoke to used the same Dulux product as you and the other neighbour the original sand and cement render, This fellow's son is a city builder and brought his team with him to work on that house The difference we could see was that Dulux Acratex, has a base coat and then the coloured Acratex is applied, where as the Concrete/Render, has the render then a sealant and then two coats of paint Both houses are 3 bedrooms with large alfresco's, the Acratex cost 15k and we think that the render would work out around the same, just takes a bit longer. Both are very happy with the end result, thanks again