Pete , I cant find your comments substatiated anywere, however i did find this
During the course of my work, I visit clients in their own home, how does the law affect me?
The smokefree law does not prohibit people from smoking in their own private dwellings. You might find the Trade Union Congress (TUC) guidance helpful, which has been developed specifically for people who work in other people's homes.
taken from ukgov.orgA major change is the code's inclusion of smoking at the wheel as behaviour that police may interpret as a distraction and failure to be in proper control of the vehicle. This addition will polarise drivers' opinions both for and against
so smoking isnt against the law whilst driving,
another 28 points are introduced including changing cds, eating a chocolate bar etc etc,
yet fiddling with a sat nav, is not covered........ strange , when a minister was asked why not, his reply "not everybody has sat navs""

what a great retort from the interveiwer, " Not every body smokes either"

Geoff