Hi Guys, I've got a few questions about the Alarm on the ST, i hope someone can help!
I woke up in the middle of the night Friday because there was an alarm going off outside my boyfriends house, the alarm stopped so i didnt think it could be mine! Then when I went out to my car on saturday to find that some idiot had knocked the passenger side wing mirror off my car - it was hanging on by the wires

!
Firstly, i dont know if the alarm was definately mine, does the alarm stop after a certain period of time if you dont switch it off if so how long the alarm go off for before is stops, and should there be any indication that the alarm has gone off?
And would the alarm go off from someone knocking the wing mirror off or would it be that someone was trying to get into the car? I am now worried about leaving her outside my boyfiends house in case someone was trying to steal her, i keep her in the garage at my house so i dont need to worry about her at home.
Also, what kind of cost am i looking at for a replacement, i dont fancy losing my no claims!
Thanks in advance for any help!
Laura