Laguna 2 alarm

After a battery charge from VERY flat, the alarm goes off when I put the card in but the car starts, obviously I can't drive around with siren and hazards. It also goes off when I open the bonnet, stops if I press down the bonnet switch but restarts when I let it go.
The fault has occurred before but usually goes away, not this time. I've tried the usual UCH fuse removal and battery disconnection, no joy.
Any clues? TIA.

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Laguna 2 alarm