From the Copeland BC site
"Q13: Does this legislation cover sports stadiums? I don't want to sit (in a covered stand) next to a smoker when I have paid ?800 for a season ticket!
A: The Bill allows regulations to be made that designate additional smoke-free places which are not covered by Clause 2 where people are at risk of being exposed to significant quantities of secondhand smoke. This might include sports stadia or other non-enclosed places, but it is a decision for the future, and only after the Government consults the public."
I think that if the Club decided to ban smoking from the ground totally they could, on the face of it I would think that it will be coming in law soon anyway, so it may be a good idea to "jump before we are pushed".