Spare megane I single button key wanted

Hi, I have searched the forum for a recent answer and I cant find anything. I have just bought a 2000 Scenic with one single button key. How do I go about getting a second key and programming it? The car probably is not woth as much as a new one from main dealer.:mad:
I am in Lowestoft - East Anglia.
Thanks.

Spare megane I single button key wanted