As i understand the no smoking law,
No smoking is allowed in any enclosed public space, including places like pub gardens.
smoking while walking down local high street is ok, but smoking while standing outside your work place is not.
I should imagine the same rule would apply to boats as it would to company car drivers.
No smoking in company cars, unless you have a convertable, then your are allowed to smoke, only if you have the roof down.
This also applies to tractor drivers in a field miles away from any road.
Unless you are in scotland, then smoking in a company car is ok, but not in a van.
The police only have to smell tobacco to be able prosecute.
So technically if you are in a company car, speeding, 1 slightly bald tyre, holding a mobile phone in your hand, get stopped, police smell burnt tobacco in the car which you had an hour ago in the services car park, you can get band from driving. = 12 points.