On Fri, 23 Nov 2007 07:40:33 +0000, Mystery Flyer wrote:

I saw a sign on platform 15 saying that PAYG was not valid for any
journeys from platform 15. I dont think it could be a penalty fare area
as you might want to use the cafe on your way to Overground, but it was
menacing ;-)

I thought PAYG would be perfectly valid on Southern from CLJ to West
Brompton for example..

Am I (as usual) missing something...

Yes. Those services leave from platform 16 or 17.