mmmmmmsugar
You can flail anytime you want, I love it. And I know what you mean about not wanting it to end -- I was exactly the same way! But yes, once you finish, you'll be able to watch again ... and you'll pick up so much more on second viewing.
Since you're just coming to it now, you might have missed this and this.
And after you watch Blackpool, you'll want to check out this and this.
As for fanfic, check out Life In 1973. I haven't been following it lately so I can't tell you who the good authors are, but there might be something to your liking. My complaint about that fandom was that it was all PWP, there was very rarely any developed plots. But as PWP goes, it's pretty.