The GOP is in a completely different position. It has turned into a lily white religious party in a country that is becoming less white and more secular with each passing day. Labour doesn't have to worry about anything. Corbyn will get shlonged in the next election, he'll resign and in 2025 they will once again be in government.
They still need to get constituencies in southern towns and cities that won't fall on their lap the way they did for Blair in '97. Effectively losing the safe Scotland seats to the SNP is a major blow.
Assuming Scotland doesn't shift, Labour needs on paper about a 10% swing to get an overall majority on the proposed boundaries. Though that's in uniform terms - in reality it's probably more like an 8% swing as marginals tend to swing more heavily against the government than safe seats.
Putting figures of Lab 42, Con 29, LD 8, UKIP 12 into the Electoral Calculus gives a Labour majority of 3. And the following Tories all lose their seats:
Boris Johnson
Amber Rudd
IDS
Kenneth Clarke
Stephen Crabb
Bill Cash
Anna Soubry
Nicky Morgan
So quite a few 'Portillo moments' are required then.
