Multiple leaders on the left. In Australia, Canada, US large increases in immigration (undocumented in the US). All of these countries have large targets increasing population at levels never seen before. It's like they are acting from the same agenda.
They are not building housing or preparing for any increases. Are they expecting a population decline?
Britain is currently governed by the UK Conservatives and elsewhere this was already taking place under previous centre-right governments (enormous increasing in housing costs took place under Trump in the US and under Harper in Canada)