I'm attempting to buy a single ticket from St Albans City through to Stockwell for use this Friday afternoon. I know what I need - a ticket to LU zones 1 & 2. It doesn't seem straight forward to do this on the GTR booking engine. I happen to know that Earls Court is in the same zone and for some strange reason that is available so I'm ok
. There doesn't seem to be an option to simply specify Zone U12 so how is someone who doesn't know the underground as well supposed to manage! Am I missing some clever trick with the booking engine?