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As someone who used to be a delivery driver in the uk the idea of getting a tip for doing a shitty job is bat shit insane, I almost never got tips beyond people telling me to keep the change and even when I did get a tip it was usually £2 for driving about 20 miles to do a delivery.
The absolute highest tip I ever got was £10 for delivering 2 full bags of food to a super rich neighbourhood in about 15 mins because it was the first house on my route. (And that £10 was still less than 10% of the cost of the order.)
Homemade blue cheese.