Dear all,
 
I have been doing some research work about travelling in London as I'm arriving a couple of days earlier. What about the visitor Oyster card? Are they for unlimited travel in London if purchased for Zone 1-6 (with an understanding that will not travel beyond that) or is there any cap??
 
IF any cap, what are the other options to hang around freely without any limit of-cos other than walking for a week ;) ??
 


 
Regards,
Karthik Nadar.