John Roberts - What's the battery like? And low light?
Firstly the battery is pretty solid, it'll last for around 260 shots and you can pick up a spare one for around £14.
Low light is ok, nothing too special. I noticed some noise at around 6,400 ISO and needed to get rid of that in post processing.
Alina Davies - What memory card to use, mine won't record for longer than 4 mins without stopping and showing 'busy' - I presume I need a better memory card but not sure which one.
My response is simple, buy the best you possibly can. I always use Lexar Professional 1000x 32GB ones. The best time to buy is when Amazon have their Prime days.
Adele Brearley-Jennings - ...what is the best setting to use (how many shots) to get a nice time lapse video of clouds?
The G7x ii really isn't designed for time-lapse and I'd avoid it. For time lapse it's difficult to find an easier simpler system than an iPhone.
Ash Fairbairn Can you use a remote button with this camera ... I've got it and don't know if you can?
I've searched high and low and all it seems to do is be able to connect to the Canon app and remote release like that. You can't connect any other sort of remote to it.