Grave crisis in London may need double-deckers

London faces a grave crisis. In a city that has been inhabited for 2,000 years, the idea of double-decker burials is an option for some cemeteries since space is an ever-increasing premium. Britain is already a crowded island and the challenge to find room for the departed with so many of the living has already led to having one of the world's highest cremation rates. In much of the country it is illegal to reuse a grave.