A few months ago I was travelling from Gatwick to Prince Regent via Canada Water. I had a pre-purchased paper ticket for the first leg and planned to use my Oyster for the second. At Canada Water, I followed the signs for the Jubilee Line but couldn't see any yellow Oyster readers, only the pink one. A train was just coming in to the platform, and I continued to Prince Regent somewhat stressed that I could be had up for fare evasion even though I was willing -- in fact wanting -- to pay. Since the signs to the Jubilee Line didn't take me through an exit, I'm not quite sure what I did wrong. There was no information on the TFL journey planner or at the station to tell me where to find a yellow Oyster reader. I had expected there would be one when entering the LU area for use of those who have not yet touched in. Is there one, and, if so, where is it? The signs to the Jubilee Line just take you up one flight of escalator and there is definitely nothing on that route that I could see. There were no staff around to ask either.