London&x27;s Safest Milk - London, 1920s Photogravure By Donald Macleish From Wonderful London By St John Adcock, 1927. From The Section Entitled Some Of The Sights And Sounds That Liven London Streets: A North London Milkman. The Three-wheeled Trolley Of The Milkman In A Fairly Small Way Is Disappearing In Favour Of The Motor Van And The Big Combine Photo