An alarm system is very good at letting you know what has happened, unless you add some kind of pre-warn, where as locks and shields can prevent the thief gaining entry in the first place.
Do I still need locks / lock shields if I have an alarm system?
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Armaplate
Trafic - Vivaro - Talento - NV300 2014 twin rear door Blockade latch shield
Sale price£56.50 GBP