When it was built after the first world war, Becontree in Dagenham was billed as the world’s largest ever housing estate – a modern utopia where more than 100,000 war veterans and workers from Dagenham in east London would have an inside toilet, a proper bathroom and gardens front and back. A hundred years after the first “home for heroes” was completed in 1921, Becontree’s centenary is being marked by a series of events and public realm...