Just incase someone elese is looking to fix this, found the solution.. as below.. cheers
My car alarm wont arm/disarm from the normal button but arms/disarms from the boot release button?
You have an earlier model alarm and a programming feature has been accidentally turned on. To return it to normal:
1. Arm then disarm your AVS car alarm and enter the car.
2. Close the bonnet and boot but make sure the drivers door is open then turn the ignition to ON.
3. Press the boot release button two times (the siren will chirp once with each push of the button, if not start again).
4. Turn the ignition off.
5. Your alarm should work as normal now.