Re: Cat ... bag ...
And yet it did when the Great North Red Wall suddenly gained some large blue holes at the last election. Admittedly because of single issue voting in the main, but it shows that it can happen.
I wonder if "voter apathy" is most of the problem with "safe" seats? Here, we've not had a Tory MP since about 1834. it was a Liberal MP from then until Labour came into existence. Labour won, then the Libs won it back, then Labour won again in 1935 and have never lost since. Most people I know either vote Labour or don't bother to vote. It's the sort of constituency that I think would benefit from compulsory voting. Even if Labour continue to win, at least we'd know it was a real majority and get a true measure of what that majority really is or isn't.