"I've been to England" is usually used if you've traveled to England, but haven't lived there or stayed for an extended period of time. "I've been in England" is technically correct, but you would not hear it often. It would be connected with some event. "I've been in England in the winter and it is not cold at all." "I've been in England during the football playoffs and it's really an experience.

I've been to England...correct I've been in England...wrong