Several decades of missionary opposition to Kromanti Play have driven this tradition partially underground and have led to serious schisms within the communities.
To see why, consider the controversy last week after safety scares led to the closure of London Underground's Northern Line to the frustration of around 600, 000 commuters.
That is what the experience of Sir Bernard Crossland, a safety expert who led the inquiry into a disastrous underground railway fire in London in 1987 which killed 31 people, suggests.