On Sat, 2 Jan 2010 18:36:01 -0800 (PST), MIG wrote:

And anyway, I think it must only apply if using LM or SN, in which
case one won't often have the choice of "what turns up first".

But it does show the complete nonsense of it, because surely the issue
is not which train you travel in, but whether you are potentially
travelling to an unbarriered NR station without needing to pass
through any barrier till the destination?

The issue *is* which train you travel in, because TfL are prepared to
take the revenue risk that you might not touch out, and the TOCs
aren't.