Hi
Try this Cheltenham company.
http://www.locksmithsincheltenham.com/ Professional and efficient, friendly service.
I got 2 of my S1 Fulvia keys made up and they look exactly like the originals (black & white).
Another time on an S2 Fulvia, the ignition key had almost snapped, brought to them and they made one up. Perfect fit!
But if you've lost the key, send them the lock mechanism and they'll make one up.