"Andy" wrote in message
...

The National Rail website clearly states that the tickets can only be
used at the stations in the list he

http://www.nationalrail.co.uk/times_...elling_connect

So technically a through National Rail ticket isn't valid at Russell
Square. Whether you get let through the barriers, other than at these
'cross-London' stations, is more a matter of luck than right.

Presumably you didn't read the whole section that you linked to then...

Paul S