Ah shit, is there any possibility of a resit?
What is a "resit"?
Ah, no chance then, or serious question? Sorry, I've been up 20 hours at this point, and have spent most of the past three nights redoing the entire paperwork system from scratch while working on my own, so my head is fairly fuzzy right now.
Serious question; that's either not a term we use here, or my head is so fucked up from finals stress that I am fully drawing a blank.
My apologies. Basically sometimes over here the professor can exercise their discretion and either let you write the paper again, or write another paper with a later due date.
My co-worker made a very similar mistake, due to working nights and this place being a fucked up mess. She wrote to her professor explaining, and because all her other work had been in on time and of a decent quality, she was given a month (which means I've spent the last month going over every single piece of her paper, despite knowing nothing about sports branding). Other friends, when I was an undergrad, had similar second chances.
It may depend on how the grading works there, with external markers and all, but given the amount of time and effort you've been putting into your course, I'd be very surprised if there wasn't some form of leeway for what was an honest mistake. And being a mature student, I think they'd also accept it was a genuine mistake without much hesitation or questioning. Writing it again would suck, but less than the alternative.