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I love a good argument 
. My view is that, if the lock was non compliant not approved and this caused the damage ie the locks had to be drilled out because the locks were non compliant and not approved, the damage can be directly related to the actions of a person so presumably the OC would have an argument that it was not liable. The more recent the non compliant not approved lock was fitted the stronger the case for the OC not being liable eg if the non compliant not approved lock was fitted shortly before the need to access the unit the OC’s arguement would be stronger than if the non compliant not approved lock was fitted a few years ago. The reason being that the longer ago it was fitted the more chance the OC would of or should of been able to discover it was non compliant not approved (of course in practise we know that the OC would most probably never find out regardless). If the non compliant not approved lock was fitted by a previous owner I would wager that the OC would not have an argument.