Well today at work it came to light that I made a big mistake working out the schools delegated budgets for property insurance. To the tune of £41k!!

In all fairness in it's just 0.0396% of the overall budget but fook me it's made me shit myself!! Never made a mistake before and I'm a bit of a perfectionist so this has rocked me and totally made me question my judgement!!

What's your worst mistake?