If you can get the immobiliser code and the key code try the 'Auto Key Centre'. I have just had a replacement key made by them for a Clio for £65 the dealer price was £150.
It did cost me £10 from a Renault dealer for the immobiliser code, which you may have to pay.
The Auto Key Centre has a web site.
www.newcastlelockandsafe.co.uk
good luck
Gary C.
January 2009