As there doesn't seem to have been any comments on this since the ban
came in, I thought I'd share the text of an email I've just sent to
Southern:

"I notice that you have placed an 'it is illegal to smoke on these
premises' sign near the entrance to the Up platform at East Dulwich
station.

Both the entrance ramp and the platform are actually entirely in the
open air, and it is therefore emphatically not 'illegal' to smoke
there.

The fact that you chose to bring in your non-smoking policy on the
same day as the Smoke-Free regulations (which only cover enclosed
spaces) came in to force is, I am sure, intended to encourage a
perception in the public mind that the non-smoking policy at open-air
railway stations is a consequence of the new law. It is not, and I
would therefore request that you remove this misleading signage: I am
sure there are many other open-air stations on your network where the
same thing has been done, so please consider those as well."

From a frustrated weed addict....