I knew I should've kept it!
I'll have to try the re-mark then, I never used to bother with marks but since I found out that degrees are graded in many overseas countries, it's no longer okay to 'just pass' - I'd like to have my degree count elsewhere as well. Most of the UK (I was watching mostly Ireland and Scotland ads) positions I was interested in required a B+ to A degree, almost nobody wants anything lower than B (<60%).
I'm just a bit nervous about re-marking, the re-marked result is final, whether it's lower than the first or not...