Often British people think that russian people is not polite, because of differences of manners in this national cultures. For example people in Russia are much more direct. In Russia people says "Pour me some tea", but for English it's strange way of request because russians don't add "could you&" and a "please", that soundes rude to English people. Also when English people at a dinner party and have to eat disgusting food they tell "Mmm... delicious". But in Russia people in such situation in most cases will tell truth.