It is always a good idea to be ready brfore you go to the UK.Many things are different from that in our country.In many places you would see people queue for something,such as at bus stop,at railway station,at check out point in market and in the post office.So you'd better to do as others do and find the end of the queue and wait for your turn.Another thing you need to pay attention to is talking in public places.Most English people speak light and gently,so they would get irritated if you and your friends talk loudly near them on the train,bus,or in a restaurant.Whenever you need help,you can always ask people for help.However,you must start your question with 'Excuse me',and always remember to say'thank you' after they give you help.If you have to pass through a group of people In a crowded public places,such as on a train,in a restaurant and cinema,you'd better ask for a space to pass by saying 'Excuse me'.you should never physically push others to get a way out no matter how urgent it may be.Don't laugn at any disabled people.If you did,you would be regarded as very rude.
If you want to talk with a person who is talking or listening to another person,you'd better wait for the end of their conversation.It is very impolite to interrupt others' conversation.
Of course there are many other things worth your particular attention.If you pay attention to these questions well,you would be warmly welcome everwhere.Otherwise,your trip can be a very miserable one as you can find some people don't like you at all.