I have an up-and-over garage door.
It has occurred to me that I can probably add an electrically operated solenoid
bolt - protruding into the track of the door as an extra level of security.
When the bolt was home the door would not lift up as the bolt would block the
movement of the wheel in the track
Rather than going out each night to check if I have locked the garage - I could
have a fused spur switch (with a red-light on) in the hall (common wall to the
garage) - I could just flick the switch to slide the bolt home in case I had
not locked the door.
Light on when I come down in morning - switch off the bolt.

Any recommendations for a suitable solenoid : I don't think I need a purpose
built solenoid door bolt - just something to operate off a transformer.