Don`t know what the business model is in the UK but over here it is all hackers.(Change whatever letter you want (first),to describe what they really are).
The sickening thing is,the drivers are given the keys,alarm code etc of the various shops on their route and have to open/close up themselves.Any stock damage comes out of the hauliers invoice,which most likely gets redirected from the drivers pocket.
They seem to attract a certain type of haulier/driver!