That looks like it. Some call it crazy paving. It usually gets laid over compacted paving sand/s. The joins between each flagstone are usually concrete with the edges concreted so it stays in place. I have seen some with sand between the joins which also looks good. New sandstone from Gosford Quarries looks superb but is expensive. (its a great product!). I'd look for some second hand stuff on Ebay/Gumtree/etc.

I checked the pavers that were left over from the same batch...low and behold 2 out of the 13 pavers also had the same white streaks on them. These are unused pavers. I'm now leaning towards the manufacturing stage and the retailer I have convinced of the same. He is sending someone out on Monday to see if some sort of chemical will clean them. I fear the worse but let's see how it goes on a couple of them. I agree with you all entirely, the streaks and scratches should have been seen before laying and not used. Luck is what I need for Monday, failing that, block your ears as I ask the pool renovator to pull up the defective pavers and lay new ones.... Renovating tests your body, mind and spirit sometimes lol

If you look at your inspiration picture , the door there is a similar tone to your timber , the stone is similar , the charoal trim and windows are similar . The render is lighter than Self Destruct , and appears to have an 'effect' so it looks aged and rustic . So personally I'd go lighter , but also ask your contractor if they can do the subtle rustic effect , using two slightly different tones of render , and some water and brushes .

Today I’ve gone and bought road base, manual tamper and concrete mix bags so I can do this properly. My question here is, a lot of places mention haunching edges as a way to keep pavers in place. If I was haunching both sides of each paver, do I still need concrete mix underneath each paver (that connects to haunches sides so all connected as one?), is is it sufficient to have the compacted road based, some bedding sand to level pavers, and haunch edges all the way vertically on driveway ? (Obviously asking this given pavers will have 50mm spacing rather than all butted up against each other). Thanks again J