all sorted... turns out there was another aftermarket alarm system in there playing around with the brant... removed that and brant works as designed. No sirens connected anymore but still have the benefits of the keypad immobilizer.

And that myth about loosing your codes after a few hours and having to reset the system, I think thats bullsh@t hasn't had a battery in it for over 18 months and prior to that its battery was flat for a good 6 months.... So that blows that out of the water