The emergency unlock is in the rear tail gate inside trim panel at the top drivers side. Lever it out and pull it to ensure it unlocks the boot lid
Battery is under the false floor in the boot or under the carpet flap if you have no false floor
Vcds would be worth using to scan the car. Module 46. Cccu It’s most likely the Q mode. Last letter of part number that is failing. Alarm problems are a common symptom of a failing cccu
Connector OBD2 connector is near the throttle pedal on the plastic trim panel
Make sure the service flap is properly closed as this often is the reason for false alarms. What sequence of flashes are you getting from the drivers door led when you lock / arm the car? If none and the indicators do not flash then something is not detected as closed. Any thing showing open on the DIS?
Could well be service flap! I didn't realise that had an alarm contact.... Rob, who I just bought it from, did say that the alarm had suddenly started going off and thought it might be connected to having the bonnet off in the last few days....
Not sure on sequence of flashes etc but just going to try that now...