Why do I need to keep forgetting the ASIair network on my Pixel 2 for it to connect again, it will say it's connected but won't find it unless I forget the network and re-enter the password ?
maybe your's pixel2 's issue, try another phone
If I'm not guiding can I leave the Mount as 'None' on the set up screen ?
yes, you can
Under telescope settings I have selected the Skywatcher SynScan do I leave the slider next to this off and Ethernet highlighted green with the IP and Port settings the same as the ones in Sky Safari or should the slider be ON ?
you don't need to care it if you use skysafari
If I want to shut the ASIair down can I use the red power icon under the wifi tab ?
yes
In Sky Safari I have Scope Type - Skywatche Synscan, Mount Type - EQ GoTo, Connect via Wifi with the IP as 10.0.0.1 and Port as 4030, is this all correct ?
you are correct