GMB, the general workers union, has said that urgent investment is needed in housing, schools and other social infrastructure to boost the economy and meet the needs of the UK's growing population.The union claims that many areas need more housing, schools, health and recreation facilities, improved transport links and more care for the elderly.The call comes after GMB's analysis of population growth between 2001 and 2011 in 174 counties, London and metropolitan boroughs and unitary authorities in...