Trying to source a duplicate key for my particular 2000 Lupo 1.0E was not easy, even though it was a simple non remote version. Most autolocksmiths were unable to clone a transponder key for this particular car.
Strangely enough, Timpsons could apparently do it, but it came at a serious price and required significant delay.
Eventually I found Autolockmaster, a non franchise company, covering central England around Gloucestershire and Worcestershire areas.
They were excellent and reasonably priced. The company consists of Martyn and Dave, both friendly and helpful types.
Link below:
http://www.autolockmaster.co.uk/