Rather than this turn into a thread of incorrect information, please ring Inland Revenue up. Remember the economy wants to ENCOURAGE exactly the people you are, entreprenerial and willling to start your own business.
I don't know how many know but there is a government initiative to raise the number of women business owners from the current level to 20% by 2006 (last figure was 15%) and Inland Revenue are keen to talk to people to get tax right rather than beat you with their proverbal stick.
Kate is right, training and set up are all tax deductible and you may be surprised what other costs are also deductible.
Ring them and get legal!!
With best wishes
Cathy Stewart