had to bite the bullet and buy a new key, although renault wanted an extra 40 quid to programe the key but i managed to do that myself by following these instructions..
CLIO II, KANGOO & MASTER INFRA RED RESYNCHRONISING
1. Turn Ignition OFF.
2. Press the central door locking button for more than 5 seconds. Note :
the door should lock then unlock.
3. When this happens, 10 seconds is allowed and the immobiliser warning
4. Point the 1st key at the receiver and press the button twice, the doors
should lock and unlock. Repeat for other remotes as required.
5. Check the remote control unlocks and locks the doors.
After all this i still love my van its just unstopable