My 23-year old daughter will be in london on her own for 2 months and is wondering what the best way is to travel around the uk. a lot of her time will be spent in london but she would also like to visit other parts of england, as well as scotland and wales. she thinks she will take the tube most days while she is in london (she'll be living in zone 6). what is the most cost effective and efficient way to get around in the uk? does she need to purchase an oyster card and a railpass? can/should she purchase either of these from the us before she leaves? any help is greatly appreciated! thank you.