I hold a zone 1 & 2 travel card (on Oyster) and purchased an off-peak day return at Liverpool Street station for Boundary Zone 2 - Hertford stns. On the return journey, I chose to change trains at Tottenham Hale and travel down to Stratford (zone 3) and break my journey there. Ticket was rejected at the barrier and two members of staff both told me that the ticket was not valid. The first one said that the ticket was valid to zone 2, and that Stratford was zone 3 (but didn't comprehend that I was still travelling towards zone 2, when I was breaking my journey). The second said that my ticket was only valid on the direct route from Tottenham Hale towards London (as I had explained that I also had a Z12 travelcard), not via Stratford, and therefore not valid for break of journey at Stratford. On the basis that there are a very small number of trains from the Lea Valley route that run via (and stop at) Stratford on their way to Liverpool Street, I believe it's a valid route, and therefore I should have been allowed to break my journey. Can anyone advise - who is correct in this case?