I'm a sucker for the neatness of the square.

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.

Thank you all for the suggestions. Will definitely check out those plastic systems. While I like the look and idea of plants/ grass I am hesitant about the practicality with cars driving and parking on them. I am worried about them growing and that enough rain will still result in the soil moving. I have attached some pre-rain pics of the drive for perspective. Half of the stones under the carport and a large amount from the top middle of the drive all ended up covering the drainage grill cover which is in front of the garage (behind the car). Thanks again. So stoked my first post here got replies

Hello Ruby, A landscape designer I recently worked with would be a cost effective and reliable solution. www.inspiringlandscapes.com.au Parveen replied to a job I posted on airtasker and she was brilliant. Went above and beyond our requirements and was very easy to work with. She is also not expensive. She designed our gardens remotely, just requiring photos, measurements, texts and one phone call. Hope this may help.