Thanks for the suggestion but its something else as mines an auto. Its definitely and annoyingly intermittent, some days its fine. I can tell when its going to do it now, when its fine and i lock the car the alarm light is solid till its armed, when its playing up the alarm light blinks straight off. Ive also discovered that disconnecting the battery and reconnecting rectifies the problem. Have fitted an isolation switch to ease this process till i work out where the fault lies!