On 19 Mar 2007 11:07:38 -0700, "MIG"
wrote:

But I do have to change at the boundary on LU. It happens to me
repeatedly when, for practical reasons, I have a paper travelcard for
zones 1 and 2 plus some Oyster PAYG credit and have to go so somewhere
like Canning town (as I did on several occasions last year). I had to
keep changing at North Greenwich, which involves quite a long trip to
the gates, adding about ten minutes in each direction.

Yeah, looks really practical to me.