There are links on each guidance page.
You basically need to so nothing to leave.
On return i assume you are either double jabbed plus 2 weeks ( and can go down the route of no test) or not in which case you are test day 1 and 6.
You need to complete the relevant entry permit which gives you an RR number for your landing form. These appear to need to be done 48 hours before.
I'm no suspected of anything. (Apart from the odd bit of pacey driving/riding now and again)
Smack heads and criminals have something to hide and fear. That means most of us are just fine.