unfortunatly it comes down to the drivers workload, all it takes is a traffic jam (bank holiday friday) or a few customers do it by the book and insist on the driver waiting while they check the goods and sign as undamaged.
I know a city link driver, and he has to miss at least 1 drop a day due to its location and the good old GPS mapping system not being perfect.
you will get the usual, carded excuse, and your reply wil be "not at my house, they screwed up"
thats enough to get your saturday premium refunded.