Right - It’s simple. Your accumulated tokens are fine as long as we remain out of Zone 1 or on the Overground lines[1]. If the previous turn had been not in Zone 2, your tokens would have been in bualk[2]. Nid is still in play for the next four turns or until we move to the Northern Line[3]. They will revoked if the next move is to an Interchange [4] Until we determine whether we are using the Somerset or Shropshire variants, I’m playing it safe by limiting myself to ten tokens. I suggest you do the same.
Charing Cross
This nets me eleven tokens.