TBH I feel sorry for delivery drivers nowadays, many of them are recent arrivals in the UK either legal or illegal. Some got here by paying out huge amounts of their family's savings to crooks and now their job is to earn cash and send it home though the Hawala system. They are an investment by the family, effectively. I had a van driving job back in the late 70s and found it the most exhausting thing I have ever done in my life, and that was before traffic jams became common. Now the UK is on a crazy path towards traffic deadlock so most of their day must be spent sitting in traffic jams, breathing filthy fumes, sweating in summer, hungry, thirsty and exhausted with the effort of delivering all those packages against unreasonable deadlines. It's no wonder they are not the cheery chappie who used to deliver the post with a tug of the forelock when I was a child. It's the reason why, when I see a driver standing knocking at a neighbour's door I usualy take the package and tell them to leave a note and get on their way. I don't dare speculate on whether they took driving lessons and got a licence before being taken on by some of the less scrupulous employers.