This is a sort of aside out of curiosity.
For my London walk yesterday Abbey Wood to Woolwich (Arsenal) I wondered if a day return from Martins Heron to Abbey Wood would work out cheaper. I was told it happened to be the same price as a Travelcard. Ah, he said, but if you are prepared to walk from Waterloo to Waterloo East rather than use the tube it is 50 pence cheaper.... Tube Waterloo to Waterloo East, that would be interesting! I got a Travelcard anyway.
For my London walk yesterday Abbey Wood to Woolwich (Arsenal) I wondered if a day return from Martins Heron to Abbey Wood would work out cheaper. I was told it happened to be the same price as a Travelcard. Ah, he said, but if you are prepared to walk from Waterloo to Waterloo East rather than use the tube it is 50 pence cheaper.... Tube Waterloo to Waterloo East, that would be interesting! I got a Travelcard anyway.