TOKYO (BT): Sir Paul McCartney has welcomed families who were forced to leave their homes as a result of the Fukushima nuclear disaster to a concert in Tokyo. The musician invited 10 people who had been displaced by the meltdown at the Japanese power plant, which occurred as a result of the earthquake and tsunami in the region two and a half years ago.  Around 160,000 people are still unable to return home after being moved from the disaster zone due to safety fears.