The sockets are 110/220V - looks like they’ll fit US and 2 pin euro plugs.
There is one socket per compartment. You might be sharing if you are sharing your compartment.
You can easily charge a phone with the shaver socket. That was no problem at all.
I could charge my Toshiba Chromebook, but only when closed. It is, to be fair, a pretty low current charger. A big laptop charger probably wouldn’t work.
You'll need a US or Euro 2 pin
You can find more gutsy UK 240V 3 pin sockets in the Lounge car. There are a bunch of people wanting to use them, so you may have to wait.Note that there is no WiFi on the train, and you’ll spend a good amount of time without any 3G on the northern parts of the trip. But the views!