On 3 May 2007 12:31:14 -0700, MIG wrote:

Going from Mudchute to Island Gardens and back doesn't involve leaving
Z2, so there shouldn't be an issue with the fare possibly being
higher, and the Tube/DLR don't have a prohibition on doubling-back. I
think the only problem might be if the ticket inspector thought you
had gone out of the station at Island Gardens, done some stuff, and
re-entered, and were trying to get two journeys for the price of one

Hmm, which raises another question. Would it be any different from
getting out and doing stuff at Island Gardens and then continuing to
Deptford Bridge (ie it looks like one journey in the same direction)?

If the inspector on the second train sees you boarding at Island
Gardens, then possibly not...