>>13041629I'm UK too, and have an MPhys
I take it you're doing a normal honours course? Because if you're doing a BSc where you'll graduate with hons, you can get away with straight up failing the number of extra credits and still get your degree, you just lose the "with Honours" in your degree title.
That's one of the reasons I took a final year Maths modules because I knew it didn't matter if I failed it or not, but luckily passed by 1 mark.
Good luck mate, I'll be up for a long time too tonight, so I'll be here lurking if you have any questions