Do The English Speak English?

I arrived at London at last. The railway station was big, black and dark. I did not know the way to my hotel, so I asked a porter. I not only spoke English very carefully, but very clearly as well. The porter, however, could not understand me. I repeated my question several times and at last he understood. He answered me, but he spook neither slowly nor clearly. ‘I’m a foreigner’ I said. Then he spoke slowly, but I could not understand him. My teacher never spoke English like that! The porter and I looked at each other and smilled. Then he saidsomething and I understood it. ‘You’ll soon learn English!’ he said. I wonder. In England, each man speaks a different language. The English understand  each other, but I don’t understand them. Do they speak English?