My astra GSi alarm goes off throughout the day for no apparent reason. I have read that there is a common fault with the power sounder for the alarm that causers the alarm to think there is a power dip and set off the alarm lights etc. Does anyone kn ow where I can buy a new unit from?, other than vauxhalls, there is one on ebay but it appears used.

Sorry did you say something - can't ...concentrate.....

think i paid £80 for one for my astra coupe turbo a couple of years ago from a dealer.
have you tried LMF?