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Nettles!
On the patio: 900x600 limestone isn't light, I've carried a lot of it. However, it's less likely to move when laid on Type 1 than smaller slabs. Hopefully they laid it on a continuous sheet of mortar at least 25mm thick, nothing else will do. For what you've paid, you appear to have got a very tidy job.
On sealants: I have never seen one that works on 'black' limestone, it inevitably fades to mid grey. If you do go down that route, ensure you get one that penetrates the stone, one that sits on the surface will wear in high traffic areas leaving you with grey paths. I will be asking how it has lasted in about 2 years if you do decide to seal....
ColinTheBald-
Mortar prob is about 25mm thick. My dad said the same things about big slabs.
I was going to get one of the sealers this guy who hates black limestone begrudgingly sort of doesn't recommend:
https://www.pavingexpert.com/stonpv05
I'm planning that it'll be something we aim to do every 2yrs... and only actually do before we move. But will keep you updated.
hugo7
Any suggestions for a plant that can live underneath this gap with no direct light?
Extra points for something leafy and jungley.