Couldn't agree more with Martin's above post. If they want to get in, they will. If they want your car, the will do everything to get it. No alarms or cctv will help.
Same can be said with mugs, tho. If a mug want to get your wallet, watch or something else, he will. It is near by people you would probably need to rely on, to help.
As for cctv point, I work for a trade cctv equipment distributor. Installers buy from me and the proper installers stay way away from Swann or eBay stuff.
Think of it that way, (example) why did you got yourself high spec 2017/2018 S3?
Normal A3 would've been sufficient, no? It is certainly cheaper. No, it won't cut it because you want that S3. Both will take you from A to B but that nice S3 will do it better.
So, good cctv equipment will give you something more that cheap stuff will not.
Technology nowadays has progressed so much that you can get great cameras and recorder for not much more than Screwfix is offering.
Want to install it yourself? Cool with that also.
Would you mess about with your nice S3 or give it to mechanics, although you "have an idea" how to do it?
Labour for installation is not cheap. Must say. That's where the knowledge, warranty and support come in.
If anyone want a quote for the cctv, I can get local installer in contact. We have customers all over UK and Ireland.
If you would like an advice on equipment, can do that also.
Also being said above, depending on your needs, proper cctv equipment should be installed.
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