Yep, apparently up here (Newcastle) they're given a minimum time to do each street. Wouldn't surprise me if that's a national thing as the new company tries to make it as profitable as possible, poor postmen and women are suffering the same crap as Amazon drivers most likely.
Back to the pizza... I've made my own sauce in the past (it was meh), not sure if you've seen in your supermarket but Heinz now do passata, was pretty good.