"Those in charge of the premises would be fools to let you get away with it, especially considering that they could face a £2,500 fine if they fail to stop you. They could also be charged on-the-spot fines of £200 if they fail to display no-smoking signs, with the penalty increasing to £1,000 if the issue goes to court."
from this web site
http://www.thesite.org/drinkanddrugs...ing/smokingban
So according to this article the officer in charge of the station is ignoring the ban and is liable to a £2500 fine
I realise that it is the local councils that enforce it but this seems to me that the officers in charge of the station don't care if people smoke in pubs and clubs