I had a conversation recently about Brent's automatic Library cards scheme. Brent was one of the 22 authorities that piloted the idea. The idea was to give school children a library card automatically to encourage them to use the service.
We were doing this back in 2012. It turned out to be harder than I had imagined. In many cases the cards are issued but then apparently lost as they are never used. For this reason the teachers are now also issued with a card so that they can borrow books for the class. While this doesn't get the children into the library outside school hours, it does help familiarity with the concept. Automatic library cards are now being pursued in Wales, Scotland and increasingly in England.