Edinburgh police (I was in Currie) were good for our break-ins, I got stuff recovered both times and one of the guys got caught. Good luck!
Do you know how they broke the locks? You can get pretty serious chains, nothing’s immune to a grinder or plasma cutter, or hydraulic jaws, but you can beat most things.
I always end up recommending these cheap-ass alarms:
Not as good as a real alarm, but, they cost nowt and they take 2 minutes to install, there’s no cheaper peace of mind. And since the sender goes in teh garage but the alarm unit in the house, it’s actually useful- not like a cheap shed alarm in the garage where they’ll just smash it in a second. You can slave 2 sets together for better cover too.