In reply to Antigua:
Sadly it is legal.
But bizarrely the increasing use of electronic cigs is causing increasing problems for companies.
They often provide smoking places outside for cigarette smokers. As you'll know you can ban electronic cigs at work. Banishing the electronic cigarette smokers to the same premises as the cigarette smokers is illegal, because you are legally falling foul of H&S because you are endangering their health by making them suffer from the smoke of ordinary cigarettes. So there is talk that in an effort to help electronic cig smokers give up the habit then they should be allowed their own outside place to smoke without being exposed to ordinary smokers. ..........
* I know!! But thats the way things are going at the moment!!!!