Only Renault can code a key to a car.
A key can only be coded to a car once. I.E If those keys are second hand they are useless.
Average price for a key to be bought and programmed from Renault is around £150
apparently you can do it yourself, iv heard this from a few ppl before ....http://www.programyourkeys.com/Renault_Clio_II_Key_Remote_Control_Fob_Transponder_Programming.html