Hi @Olly Paul and welcome! Do you follow Alastair on Twitter (@paperbullets)? He does, once in a while, change up the schedule so that people in different parts of the world can participate, and that's usually where he announces it.
I watched "Star Wars: A New Hope" last week with some wonks and wow at how many times I got chills, honestly. That's another good one for this sort of thing. (We do have all day to strike! We could do more than one for whoever's around, right?)
I'm in exactly the same boat with my 2015 NaNo novel. Everyone -- I mean EVERYONE -- says that I should plow ahead and get to The End before revising, but I just can't do it when so much is wrong with it. There's a lot that's right, too, but one of my main characters needs better motivation and goals, and without them the book fails. So I'm finding it hard to move forward, just like you; I find myself completely unable to write without going back to fix things, and that's no good for anyone. Maybe we can start a support group for this sort of thing.
I'm glad it works for you, @Nerd_flag! I'm the opposite. I type pretty fast, maybe 80wpm, and if I try to write longhand I lose five thoughts for every one I get down. I get too frustrated like half my writing is just gone into the ether if I don't get it down, and what if it's the best half?? I'm fine with using a pen and paper for notes or ideas, but for actual drafting I do like typing. (For ideas, I also talk into my phone which helps a lot; it's especially helpful to speak the dialogue.)