Re: Londen
well you said where is green street with a question mark? hence the confusion!
one thing I want to add her any london visitor, do get Oyster card for travelling on Tube, Train,Tram or Buses. Paper ticket fare is way too much compared to the plastic card for refundable £3. get that, top it up use it, before you leave get it refund for your remaining balance and deposit Or keep it for future london travel.