The novel service is running until the middle of December as a pilot scheme in Milton Keynes, Buckinghamshire, to see if it is a viable business option in the longer term. The automated delivery vehicles are powered by electric batteries, which supports the environmental credentials of the Enriched range of drinks from supplier Plenish. Kara Rosen, founder of Plenish, said: "We are a future-conscious brand which is always looking to innovate. Through our new Enriched range, we have created the milk of the future – so what better way to deliver it than through a robot milk round? "Our brand ethos is all about'healthy you, healthy planet' – and this is the embodiment of that."