I have searched for instructions on how to program the key fob but had no luck.I'm planning on buying a second FOB as my Disco came only with one. I got these instructions so here they are. I havent tried them please post if it work. If these instructions are already here sorry for the post,and please delete this one
thanks
1. Starting conditions: Ignition Off,doors unlocked,bonnet switch depressed.
2. Carry instructions 3-9. Within 8 SECONDS
3.Switch ignition on
4.Switch ignition off
5.lock doors
6.unlock doors
7. release bonnet switch
8. switch ingnition on
9. switch ignition off

If alarm is correctly accessed, horn will sound and LED will light. Its now possible to program two handsets of correct frequency to vehicle alarm ECU. this must be carried out within TWO MINUTES

10 press and hold down button on first handset until dash LED flashes
11. repeat instruction 10 for the second handset
12 the LED will extinguish if both handsets have been initialized correctly