Currently I get free bus travel because of my Oyster card, but that expires in September and I think I can then get another one in which I get a discount, but I was just wondering if there was one where I don't have to pay at all. :P
Also, my student bank account offers a bus card discount I just realised. I wonder if I could use that in conjuction with the discount Oyster.... probably not, I suppose, one or the other I'm guessing. :P