In very cold snap battery went flat after car not used for 2 weeks. Alarm
was somehow triggered on opening with key as did not respond to plip.

After charging the car starts and has driven 500 miles since, but the red
LED on the alarm button on the dash remains solidly lit.

I have a key which fits a lock inside the offside boot, turning this 90
degrees makes no difference, then turning it back to the original position
triggers the alarm.

The owner's handbook suggests behaviour from the red LED that does not
reflect how it is behaving and does not even mention the key in the boot -
neither do any search engines.

Any advice appreciated. In essence I have a solid red LED on the alarm
button which should not be there and never has been before.

Thanks,

John Banks