Another question regarding the 2-4-1 deals and the travelcard. We will be in London for 11 days. If I were to buy a 7 day travelcard, what should I do for the remaining 4 days? Would an oyster card make sense at that point, or is there a 3 or 4 day travelcard? Also, I'm really only planning to use the discount at 3 or 4 places, tops. Is the 7 day travelcard still the best way to go? During those 7 days we are going to the Harry Potter Studio Tour. I understand that a regular travelcard won't cover that journey--should I add Watford Junction to the 7-day card, or is it not worth it? Thank you.