This dataset shows projected pupil growth in local authorities and school place planning zones, based on NHS live birth data and internal migration data, and capacity in existing schools. (newschoolsnetwork.org)
I don't think the process of normalising constituency sizes is as big a thing as it seems, a «normal» boundary review (which would have been due anyway) would typically move some seats from Labour to Conservative due to the current trends of internal migration. (ukpollingreport.co.uk)
This page develops resources that look at the causes and consequences of forced internal migration in Nigeria, developing a detailed example of environmental and political push factors. (thinkib.net)