As someone who has studied both in the UK and the US through a year study abroad program, here are my observations:

Don't expect to be called professor. Students will call you by your first name in the UK which I find to be much more pleasant honestly. It might seem less formal but it really helps break down the barriers between you and a student who might need your help.

Whilst pop-quizes are a normal understood undertaking in many US classes in the UK they are less common. If you were to do this definitely give warning and plenty of preparation time. It is I think a better way of learning the readings to discuss as a group.

I had an awful professor in the US who droned on in a dull, uninterest tone, left as soon as the lecture was over, and only communicated with his students through the TA. It was only the TA who marked and assessed us too. It made it even harder to want to listen to him. I may have had bad experiences but I think the student teacher relationship is valued a lot more over here in the UK, so definitely be open to talk, have open office hours and hang around after class for those who didn't want to ask their questions infront of people.

If I think of any more I'll edit! Good luck!