It very much depends on the type of work you do, strangely. I hope this helps:
As far as working from home is concerned (whether as an employee or running a business from home), there is an exemption from the ban. However, the smoking ban will still apply where the private dwelling is used solely for work purposes by more than one person who does not live there or where members of the public (such as clients and customers) attend to deliver or to receive goods or services. Thus, if you run a business from home in a part of your home that you use solely for work and either your clients come round from time to time or you have an employee working for you there, the ban will still apply. That said the ban does not apply in a private dwelling where work is undertaken solely to:
� Provide personal care for a person living in the dwelling.
� Assist with the domestic work of the household in the dwelling.
� Maintain the structure or fabric of the dwelling.
� Install, maintain or remove any service provided to the dwelling for the benefit of persons living in it.
http://www.fsb.org.uk/news.asp?REC=4128