Tommy tee man, In my place of work, we have a 109 digital non-fixed camera system that is opperated by 10 full time employee's, 2 at a time. This is done on a 24/7/365 basis. The camera opperators are fully trained to a very high standard and are tested on a yearly basis. They are good at their job and very proffecional. We have NEVER successfully had a criminal conviction based solely on CCTV image. To do that you need a clear, stationary image of someones face of passport quality. There can be no dubiety whatsoever.
Professional criminals know this stuff. They know when cameras are vulnerable. The learn their field of vision and how fast they move. They know the blind spots and test on a regular basis. What cameras do is deter the opportunist thief.
I would not recommend cheap cameras at all. They are pointless. And if you go cheap, you are as well going £20 cheap irather than the ones you have here, as neither are of any use to you. Spend the money on a good lock for your store. A strong entry point (new door made of steel?) with a motion light and a local GSM alarm.
If you decide to go for the cameras, take heed:
The document retantion policy Uk 2009 act states that recordings can be kept for no longer than 14 days, unless specifically requested by the police.
You can not have a camera recording any public place, throughway, or private property not beloning to you.
Remember, if you do not obey the law when fitting the system, it could backfire on you in a big way. If you try to submit illegal evidence in court you could be prosecuted yourself. Remember, the police do not choose which laws they enforce.
And to finish off, I hope that thieving C*NT has a long and miserable existence and am sorry to hear you stuff has been stolen.