- An app driven by a SIM card is installed in the bin
- An infra-red sensor in the bin works out how full it is
- Messages are then sent by text to Westminster City Council
More top news
Shocked neighbours have told of their fear and paid tribute to a "nice lady" found stabbed to death at her home in Muswell Hill.
The deputy leader of far-right group Britain First has been arrested in London over a speech made at a rally in Belfast this summer.
Captain Mike Green, a senior flying instructor, was piloting the two seater helicopter involved in the crash.