I agree, constructing the effect yourself is very satisfying. However, for speed, I recently bought “Twitch” from Video Copilot and it comes with a great 8mm overlay which has allsorts of dust and scratches on it. You can use the plugin itself to add the light flicker and even simulate a bad film gate.
Toby
P.s I have no affiliation to Video Copilot 🙂
“Outside of a dog, a book is man’s best friend. Inside of a dog, it’s too dark to read”