Blushingsnail not a problem, I'll let others know.

I choose not to have shutters, but have anti-terrorist shatter-resistant film on all my glass frontage, this basically means that if anyone smashed my windows the shattered glass would stay in place and would make it very difficult and take quite a long time for anyone to actually get in to the shop. This also gives me peace of mind knowing that my customers would be safe inside if a freak accident happened while opened.

Believe it or not this is actually cheaper than installing shutters, I'd strongly recommend it to all new shopkeepers.