Section 3 of the railway bylaws has this to say on Smoking:

No person shall smoke or carry a lighted pipe, cigar, cigarette, match, lighter or other lighted item on any part of the railway on or near which there is a notice indicating that smoking is not allowed.

These were taken at Manchester Piccadilly. A station with BTP and 24 hour security service patrols.

If you can break the law here with impunity, how are people supposed to feel safe?