England & Wales Constituency Boundary Proposals are here

[muriel_volestrangler]

Jeremy Corbyn, George Osborne and Boris Johnson are among high-profile politicians who will see their seats redrawn in a dramatic shakeup of the country’s electoral map that will alter the constituencies of more than 500 MPs.

Overall, Labour is worst hit by the shifting boundaries, which are part of an effort to cut the number of politicians in parliament from 650 to 600, with significant changes for MPs such as Yvette Cooper, Tristram Hunt and Owen Smith. Many opposition politicians will fear that local members will take the opportunity of a shakeup to try to deselect them if Corbyn retains the leadership later this month.
...
Jon Ashworth, who is a key shadow cabinet minister leading on the policy, called the proposals “unfair, undemocratic and unacceptable”.

He said it was wrong for the calculations to be based on the electoral register at the end of 2015, meaning that 2 million voters who signed up in the run-up to the EU referendum result are not included.

http://www.theguardian.com/politics/2016/sep/13/corbyn-johnson-and-osborne-among-mps-hit-by-electoral-shakeup

You can get the initial proposals from here: http://boundarycommissionforengland.independent.gov.uk/2018-review/

There's also a site for consultation, but it was refusing to connect the last time I tried: http://www.bce2018.org.uk/

Wales loses a lot of seats, because it was over-represented at Westminster.