If you'll be operating a mobile service (akin to the way that a plumber works) you probably don't need to notify anyone.
If you'll be inviting clients into your home, you might fall foul of any covenant on your property which forbids business use, or you might need planning permission. Further, if you're using part of your home for business purposes, the Valuation Agency (together with your local council) might require you to pay business rates (as well as council tax):
http://www.voa.gov.uk...d_business_rates.html
Chris