Same-day delivery is a consolidation play. A large network with sufficient volume will benefit from significant economies of scale and outperform smaller networks. Countries with a high share of inhabitants living in densely populated areas, such as the UK (almost 60 percent of the population live in areas with at least 500 inhabitants per km²), provide favorable conditions for establishing a network of this kind, as more deliveries can be carried out per km². Currently no established networks provide same-day delivery at scale, so consumers handle most of their shopping logistics themselves.
One a week so have a ton of them. main difficuly is that driving the essentially site focussed safety culture message in an office environment ultimately gets a bit nannying - handrails, slips, standing on chairs, carrying hot coffee, crashing through doors, paper cuts.....mostly you end up focussing on the uncontrolled part of your day - when you leave work and H&S goes out the window, phones when driving, diy - hand injury, ear and eye protection, ladders etc.
For hardcore plant stuff google charlie morecroft, really puts the human element into forefront.