Birth rates have been rising everywhere in the developed world recently.
Deep recessions = baby booms. Happened in the 30s, 50s and 80s - while in the 20s, 60s, 90s and 00s birth rates fell (going by memory here). Looks like the pattern continues...
Re the policy: should have been the policy response from the UK Government from the get go (I'm talking financial crisis response), rather than this austerity bullshit which is so obviously self-perpetuating and self-defeating that its made things worse. However I note its all well and good to build a city from the ground up, but what are you going to do about jobs, infrastructure and the like around it?