Right... I have followed all the threads I could on this and other GM related sites.
The problem is the alarm going off when after 10 mins 20 mins etc, I have located the power sounder cut open, bought the recommended replacement batteries (from cellpack as per "How to..guide" ), opened the blighter. Three observations
1. Completely different batteries - varta ones in the PS , emerich ones from cell pack, could be adapted quite easily
2. Voltage on both PS batteries 4.02v
3. Someone somewhere mentioned that the rear 1/4 windows on zafiras can give faults that trigger the alarm.
Has anyone out there got any ideas?