You may want to consider whether you want to work through a Limited Company when temping or indeed set yourself up as a Limited Company.
There are a number of firms that act as Limited Companies that you can work through. If you are interested in setting up a Limited Company yourself, visit the Companies House website for guidance on this area.
Other useful websites to visit:
Inland Revenue - www.inlandrevenue.gov.uk
Customs and Excise - www.hmce.gov.uk