On Tue, 27 Oct 2009 23:00:50 GMT, Neil Williams wrote:

The barriers at the end of his journey probably ate that. (They do at
Watford Junction anyway

That's naughty - they're still valid on the 258.

AIUI, an outboundary ODTC loses its validity on return to the
originating station. So it might be inconvenient, but I don't think
it's strictly naughty.

I'm sure I've read something official about them still being valid on
TfL buses outside the zones, but can't find where now.