Groups
For groups of 10 or more fare-paying passengers you can get Group Day Tickets. Provides unlimited travel at any time and on any day within the zones paid for. You can only get these as paper tickets, not on an Oyster card
£4 per adult, £1.50 per under 18. Z123456
http://www.tfl.gov.uk/tickets/14416.aspx
Where can I get these tickets from? Just any LU ticket office? I have 13 Under 18's and 1 adult travelling.