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Sounds like the solenoid in the drivers door lock is faulty. The Lag II doesnt use door plungers to control the light, but solenoids in the locks. If I remember its a right royal PITA to fix too - I may be wrong though.
Oh and yes all Lag II's should show the outside temperature up by the clock. I imagine your temperature prob is dead. Its in one of the wing mirrors, you'll know which one as its the one with a little bump / nipple on the underside.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo