I doubt this. Even as a child I knew that a travelcard must be valid for all the zones you travel through. Of course, if challenged, someone knowingly cheating would claim they didn't realise.
> you tap pink validators at key interchanges > you'd need to pass through to do your slower > and less central route avoiding Zone 1"
Wow! I had no idea this was a thing. I moved away from London in 2010, and now I'm curious to know whether this was implemented before or after I left.
