Smoking is banned in any vehicle but private, with or without passengers.
It is also banned in any public building or workplace, pubs, clubs ,restaurants, offices, factory floor, its effectively banned from any where but your own home or out side place.
Here in Scotland they are considering banning smoking related items from being on display for sale in the shops, you would have to know what you want and ask for it.
If it works up here it will probably go U.K. wide too.
Cigarette advertising has been banned for a few years in the U.K. and across Europe, no F1 cars with Marlboro on the wings etc.
BTW, none of this makes any difference to me,I dont smoke or drink, just makes for a cleaner atmosphere, if not sometimes bad tempered!
So, with riding with my lights on, no smoking, no drink, I should see 100yrs or more, thats if I dont get wiped out by a bad tempered road rager on the way to a pub gasping for a smoke!